A power plan is a collection of hardware and system settings that manage how your computer uses power. You can use power plans to reduce the amount of power your computer uses, maximize performance, or balance the two. For information about making your laptop battery last longer, see Conserving battery power.

Here are answers to some common questions about power plans.

How can I choose a different power plan?

If you’re using a laptop, click the battery icon  in the notification area on the taskbar, and then select one of the power plans that appear on the battery meter. By default, the Balanced and Power saver plans appear on the battery meter. Your computer manufacturer might provide additional plans and might customize the battery meter.

Battery meter showing power plans

If you aren’t using a laptop, or if you want to use a power plan that isn’t on the battery meter, do the following:

1. Open Power Options by clicking the Start button , clicking Control Panel, clicking System and Security, and then clicking Power Options.
2. On the Select a power plan page, select a power plan.

   If you don’t see the power plan that you want to use, click Show additional plans.

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The chemical reactions on discharge convert lead, lead oxides, and acid into free electrons (good stuff), water (also good stuff), and lead sulfates (bad stuff). The chemical reactions on recharge reverse the process. The tricky part is to recharge the battery in such a manner so that the sulfates are eliminated by recombining with water to re-form into acid without loosing the hydrogen and oxygen gasses that make up the water. Oxygen and hydrogen gas will be released at recharge voltages between 13.8 V (2.30 volts per cell) and 14.2 V (2.37 vpc). You will see later that virtually all battery chargers have output voltages during some portion of the charge algorithm that are higher than the gassing voltage. Battery construction plays a very large part in determining what happens to the oxygen and hydrogen gas after it is released as a by-product of the recharge chemical reaction.

What is a charge algorithm?

The battery charger controls the voltage that is applied to the battery, the amount of charge current that is supplied to the battery, and depending on the level of sophistication in the charger technology, the timing associated with what may be multiple voltage and current levels. The following paragraphs provide an overview with some significant detail of the different charging modes, or stages that may be included in a charging algorithm. Basically, a charge algorithm is a collection of all of the software controls over electrical parameters and timing that are applied sequentially to the charging system hardware for the express purpose of recharging a discharged battery. Stated a little more directly, the charging algorithm is what controls the battery charger behavior as measured at its electrical output terminals.

Battery Charging Algorithm Fundamentals:

There are 4 distinct charging modes, or stages, within a battery charging cycle. Not all of these modes are essential in every battery application. The software that controls the charge cycle modes is often referred to as an algorithm.

The General 4 Step Charging graph shows the 4 distinct charging stages or modes that will be described in detail later. The alpha indicators on the axes indicate general values for time, charging voltage, or charging current.

General 4 Step Charging Algorithm

Figure 1: General 4 Step Charging Algorithm
For the voltages: “A” is the voltage value held constant by the charger during the Absorption stage. “B” is the voltage value held constant by the charger during the Equalization stage. “C” is the voltage value held constant by the charger during the Storage or Float stage.

For the currents: “D” is the regulated current limit or the current value held constant by the charger during the Bulk Charge stage. “E” is the regulated current limit or the current value held constant by the charger during the Equalization stage. “F” is the maintenance current value provided by the charger during the Storage of Float stage.

For timing: “W” is the elapsed time for the Bulk Charge stage and is the starting time for the Absorption stage. “X” is the total elapsed time for both the Bulk Charge and Absorption stages. The duration of the Absorption stage is numerically equal to (X – W). “Y” is the total elapsed time from the start to the end of the current limit phase of the equalization stage. “Z” is the total elapsed time from the start to the beginning of the Storage or Float, Maintenance stage. The duration of the Storage or Float, Maintenance stage is indefinite. The duration of the Equalization stage is numerically equal to (Z-W-X).

The charger will remain in float as long as power is applied to the charger, or until some monitored circumstance occurs which resets the charge cycle, or until power is removed from the charger. A typical monitored circumstance that would trigger a charger reset would be if the battery voltage dropped below a certain value. This would indicate that a parasitic load is attached to the battery while it is being charged and that the amplitude of the parasitic load current is greater than the current being supplied by the charger. In that case, the battery is being discharged even while the charger is attempting to maintain its charge level. This circumstance is not at uncommon in industrial applications.

Virtually every battery manufacturer has developed different charging algorithms to optimize the recharge characteristics of a given style of battery in a given application. Sometimes the differences between these charging algorithms seems to be fairly insignificant, but depending upon the battery application, even seemingly slight differences in the charging algorithm can have a significant impact on the cycle life of the battery.

General 3 Step Charging Algorithm

Figure 2: General 3 Step Charging Algorithm
The General 3 Step Charging graph above shows the 3 charging stages. The descriptions are identical to the General 4 Step Charging Algorithm, except that there is no equalization charge stage. The alpha indicators on the axes indicate general values for time, charging voltage, or charging current.

For the voltages: “A” is the voltage value held constant by the charger during the Absorption stage. “C” is the voltage value held constant by the charger during the Storage or Float stage. For the currents: “D” is the regulated current limit or the current value held constant by the charger during the Bulk Charge stage. “F” is the maintenance current value provided by the charger during the Storage or Float, Maintenance stage.

For timing: “W” is the elapsed time for the Bulk Charge stage and is the starting time for the Absorption stage. “Z” is the total elapsed time for both the Bulk Charge and Absorption stages. The duration of the Absorption stage is numerically equal to (Z – W). “Z” is the total elapsed time from the start to the beginning of the Storage or Float, Maintenance stage. The duration of the Storage or Float stage is indefinite.

Adaptive 4 Step AGM Charging Algorithm

Figure 3: General 4 Step Charging Algorithm
For illustration purposes, each time interval corresponding to each charging mode will be highlighted on the above graph immediately preceding the description of the charging mode.

The previous graph shows voltage and charge current time profile for the most sophisticated charging algorithm available in Deltran chargers. This charging profile was developed by Deltran engineers in conjunction with manufacturers of Sealed, AGM (Absorbed Glass Matte), Lead Acid batteries. This particular algorithm, the Adaptive 4 Step AGM Charging Algorithm is only available on the higher-powered Battery Tender? products: the 300 and 600-Watt SuperSmart® High Frequency (Golf Cart style) chargers, and the High Powered, DVD and DVS dual and single output portable chargers.

Bulk Charge Mode: Constant Current, Increasing Battery Voltage

During this time, the battery is fully or partially discharged, in some state of charge less than 100%. On a 12 volt battery, the no load battery voltage is between 11.4 VDC, fully discharged, and 12.9-13.0VDC, fully charged. When the battery charger is connected to the battery and then turned on by plugging it into the 110 or 220VAC power source (wall socket), the charger will attempt to bring the battery voltage up to the level required to be in stage 2), the absorption charge mode. Sometimes this voltage level is called the “quick charge voltage”. Typically, this voltage is in the 14.2 to 15.0VDC range. The battery voltage rises because the charging current that is provided by the battery charger is replenishing its internal charge capacity. During bulk charge mode, the charger current is flat (constant) and the battery voltage is rising.

Absorption Charge Mode: Constant Battery Voltage, Decreasing Charge Current

Stage 2) Absorption Charge Mode: At this time the battery is approximately 80% recharged. The charger will now attempt to hold its output voltage constant while the battery continues to absorb charge (draw charging current) from the charger. The rate at which the battery continues to absorb charge in this mode gradually slows down. The amplitude of the charger current is gradually decreasing. During absorption charge mode, the charge current is falling and the battery voltage is flat (constant).

The transition from absorption charge mode to the next stage is determined either by a timer, or by the charger sensing the value of charge current and then switching over when the charge current drops below a certain threshold. For example, the Battery Tender? Plus (part of a different product line) switches out of absorption mode when the charge current falls below 100 milliamps (or 0.1 amp) or when the absorption mode has lasted for 8 hours. With properly set timers or charge current switch thresholds, the battery should be charged to more than 95% at the end of absorption mode. Ideally it would be at 100%, but there are some practical limitations that usually prevent full recharge.

Equalization Charge Mode: Constant Charge Current, Increasing Battery Voltage

Stage 3) Equalization Charge Mode: The equalization charge mode is optional and usually only included at the request of a specific battery manufacturer. At this time the battery is approximately 95% recharged. To speed up the delivery of the last 5% of the recharge, one of two things usually happen.

1) The charger switches over to a true constant current mode where the value of the charge current is a small percentage, usually never more than 20%, and typically in the 5% to 10% range, of the numerical value of the battery’s 10 or 20-hour capacity in amp-hours. Since the charger circuitry does not have the ability to directly sense the battery capacity, these relative percentages will only be true for a specific range of battery capacities. There is also a safety timer engaged and there is often a safety voltage limit, a “lid” or “ceiling” that performs an automatic shutoff or switch to stage 4) if the battery voltage attempts to rise higher than the safety limit. In either case, the higher constant voltage, or the lower true constant current perform a similar recharge function. That is to safely replenish the last 5% of the battery’s charge, in a minimum amount of time.

2) The charger voltage is set high, maybe 3 to 4 volts above the battery no load fully charged voltage with a safety timer. The battery then draws current until the timer shuts off. The reaction of the battery during this time is first to force the charger to deliver its maximum current. Then the amplitude of the charger current gradually decreases until the timer forces the charger to switch to the next charging mode. It’s almost like repeating the bulk and absorption charge modes together in a compressed time frame, with different voltage limits.

Float Maintenance Charge Mode

Figure 7: Float, Maintenance Charge Mode: Constant Battery Voltage, Decreasing Charge Current
Stage 4) Float, Storage, or Maintenance Charge Mode: The float charge mode is also optional on many battery chargers. However, ALL Deltran chargers have a float, maintenance charge mode. Basically a couple of features can be implemented in a float charge mode. The first is to simply put the charger in a constant (flat) voltage mode. The magnitude of the voltage should be a few tenths of a volt above the no load, fully charged battery voltage, typically between 13.2 to 13.6 VDC. The second is to turn off the charger, and monitor the no load battery voltage. When the no load battery voltage drops below a present threshold, the charger comes on for a short period of time in a constant voltage mode. The numerical value of the voltage is usually somewhere between the typical float voltage and the manufacturer’s recommended quick charge voltage. That was the constant voltage value used in the absorption charge mode, usually between 14.2 and 15.0 VDC. This second method is sometimes called “hysteresis charging” or “window charging”.

Traditionally, the entire Battery Tender product line has incorporated a constant voltage float charge mode. The 70W product line implements a somewhat unique combination of the two general methods just described. In float mode the charger output voltage is a constant, somewhere between 13.2 and 13.6 VDC, depending on the specific model number. Also, the charger continues to monitor the battery voltage. If the battery voltage drops below a threshold, usually set at between 12.0 and 12.5 VDC, the charger will reinitialize its charging cycle. The Battery Tender response to low battery voltage is more effective than the traditional hysteresis charging method because it allows the battery to be fully recharged more quickly.

NOTE: Without some type of battery or charger malfunction, the only way that the battery voltage can go down below the charger output voltage is if the battery is connected to an external load that draws current from the battery. As the battery delivers current, its charge capacity decreases and its voltage drops. When the battery charger is connected to the battery while the battery is under load, and if the load current is large enough, then the charger current is diverted to the load.

As long as they are functioning properly, the Battery Tender battery chargers can be left connected to the battery indefinitely.

NOTE: The obvious question is: “What happens if the charger is not functioning properly and it is left connected to a battery?” Batteries store a tremendous amount of energy due to their electrochemical composition. As that energy is transferred out of the battery into a load (discharging) and into the battery from a charger (charging), there are some risks involved. The basic chemical reaction occurs between the conductive lead grid, the various oxides and active materials, and the sulfuric acid, which is the electrolyte. Depending on the reaction rates, the sulfuric acid will decompose in to gaseous components. The biggest danger to a battery is water loss, ultimately resulting from the escape of hydrogen and oxygen gasses during recharge. The importance of charging voltage values applied to a battery, and the reason that several manufacturers recommend different charging voltages, is the effect that the charging voltage has on the acid decomposition into gas, or just simply “gassing”. The more gas that is generated, the more water that is lost, the quicker the battery dries out, and ultimately wears out.

Now back to the original question. If a battery charger fails during continuous float / maintenance mode such that its output charging voltage is higher than the minimum gassing voltage of the battery, the battery will expel gas and dry out. The other danger is that any mixture of hydrogen and oxygen containing more than 4% hydrogen is potentially explosive. Therefore it is very important to periodically monitor the battery to make sure that there is not a problem. Also, the battery should be recharged in an open area with good ventilation, away from any sources of sparks or combustion, like water heaters and electrical motors.

Deltran Chargers: General Charging Algorithm Summary:

The Battery Tender Junior implements 3 of the charge cycle stages, Bulk, Absorption, and Float.

The Battery Tender Plus implements 3 of the charge cycle stages, Bulk, Absorption, and Float.

Shop Chargers, 5 & 10 Bank units implement the same algorithm as the Battery Tender Plus only at a higher current.

The International Battery Tender both the single output unit and 4-Bank Battery Management System implement 3 of the charge cycle stages, Bulk, Absorption, and Float. (Exactly the same as the Battery Tender Plus)

All 70W Battery Tender product line models (Lightweight, On-Board, Power Tenders) implement 3 of the charge cycle stages, Bulk, Absorption, and Float.

The high power chargers, DVS, DVD, and SuperSmart® High Frequency (Golf Cart style) chargers implement either 3 or all 4 of the charge cycle stages. The Equalization charge mode is only used on specific models.

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HP has announced its revamped series of Envy ultrabooks at a press conference in Shanghai and leading the new range is the flagship Spectre XT.

While other HP ultrabooks have had a unique look all their own, the new XT is a step backwards – the tapered metal design apes the Macbook Air which inspired ultrabooks in the first place. The pre-production unit we tried didn’t feel very sturdy either – the lid flexed alarmingly under even a minimal amount of pressure.

We were also disappointed to discover that the 13in screen only has a screen resolution of 1,366×768 pixels. A higher resolution of 1,440×900 or 1,600×900 would make it far more useful, especially when working on large documents and images or using programs with lots of windows.

At least the Spectre XT has a comfortable and responsive backlit keyboard and weighs just 1.4kg. It will come fitted with Intel’s latest Ivy Bridge laptop processors which should be faster and more power efficient than the Sandy Bridge processors used in current ultrabooks. The Spectre XT will come with other benefits as well, such as preinstalled copies of Adobe Photoshop Elements and Premiere Elements 10 for editing photos and videos respectively.

Exact UK pricing and specifications weren’t yet available at the time of writing, but Eurozone pricing starts at €999. The Spectre XT should be available from the end of June.

Bigger and better?

If that sounds like far too much money to spend on a laptop, HP has cheaper ultrabooks available in the form of the 14in and 15.6in Envy 4 and 6 models. Although these are heavier at around 1.8kg they should also be cheaper at around €650. While these laptops will be available in either a striking black and red or plain brushed metal, the pre-production models we saw exhibited the same creaky build quality as the Spectre XT which we hope will be fixed in the final models.

Sadly, despite their increased screen size, neither the 14in and 15.6in Envy ultrabooks will have high resolution screens and will be limited to the same 1,366×768 pixel resolution.

Interestingly, these models will be available with a choice of either Intel or AMD processors. The Intel-equipped models will, as expected, come with Intel’s latest Ivy Bridge processors, but there’s an option to have AMD Fusion processors at a slightly lower price. Since Intel owns the ultrabook trademark, HP is calling these new AMD thin and light laptops ‘sleekbooks’.

While HP’s use of AMD processors could provide much needed competition to keep Intel on its toes, we’re sceptical about the increasing wooliness of the already vague ultrabook brand. All ultrabooks were previously 13in laptops with solid state disks, but screen sizes are creeping upwards and cheaper but less rugged hard disks are taking the place of SSDs too. This risks diluting the usefulness of the ultrabook brand as an easy way for customers to identify rugged, fast booting, thin and light laptops. This may not matter though if all laptops eventually take on ultrabook characteristics.

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Battery icon showing a notification that a battery is no longer holding a full charge

This notification is new in Windows 7—earlier versions of Windows can’t notify you when your battery is going bad. If you’ve recently upgraded to Windows 7 and are receiving this notification, it probably means that you need to replace your battery. If you don’t want to receive this notification, you can turn it off by clearing the check box on the battery meter.

If you receive the “Consider replacing your battery” notification, and aren’t sure if you should replace your battery, here are some things to consider:

• Laptop batteries have different capacities—the amount of charge that they’re designed to hold. Over time, laptop batteries will lose their ability to hold a charge, as is the case for all rechargeable batteries. This means that even though you’re fully charging your battery, the actual amount of power that the battery can hold is going down. You can find information about the capacity of your laptop battery by looking at the information printed on the battery, or reading the information that came with the laptop or battery.
• Even relatively new batteries can fail or become damaged—exposure to extreme heat can damage a battery—and quickly go from holding a charge to not holding a charge. Many computer manufacturers have a warranty of one year for laptop batteries. If your battery is less than a year old or has become damaged, contact your computer manufacturer. If the battery is over a year old, it might need to be replaced.
• If you plan to replace your battery, you should contact your computer manufacturer, or buy a battery that is made by your computer manufacturer, since it is designed to work best with your computer.
• The manufacturer of the battery is responsible for the condition and quality of the battery. Batteries do sometimes fail, so it’s a good idea to only buy new batteries that come with a warranty.

Note

The battery meter in Windows might become less accurate as the battery begins to hold less capacity. Your laptop might go into hibernation or shut down sooner than indicated.

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First put the laptop computer to sleep by turning off the screensaver and other power management settings of the computer. Then fully charge the computer and allow it to run all the way down until the computer shuts off automatically. Once the laptop battery has fully drained, charge it back up again and restore the screensaver and power management settings.

Re-calibrate your battery every month or so by fully charging, fully discharging, and then fully charging again. Basically to have a chance to re-calibrate your laptop battery is to turn off all power-saving features completely and then fully recharge them.

The above way of re-calibrating the laptop batteries works well with laptops using Ni-MH cells. But not with laptops using Li-Ion batteries because deep discharges will actually decrease the charge capacity and lifespan of Li-Ion cells. Moreover Li-ion batteries irreversibly lose approximately 20% capacity per year from the time of manufacture at a typical 100% charge level at 25deg.C, even when unused. Li-ion batteries irreversibly lose approximately 2%, 4%, 15% at 0deg.C, 25deg.C and 40deg.C respectively, when stored at 40% charge level. That is every deep discharge cycle decreases the capacity of the Li-ion batteries. As the Li-Ion batteries are chemical in nature, charging and recharging is not going to fix the problem once the chemical reactions stop happening. Therefore the best advice for re-calibrating the Li-Ion batteries is to store the battery at 40% charge if it kept unused for any unlimited period of time. Also don’t leave the battery in the laptop if you don’t use the battery or if you plug the laptop into outlet power.

You can also re-calibrate your laptop battery using Lenovo Thinkpad Battery Maximizer in order to maximize your laptop battery’s life. If your laptop has IBM ThinkPad Battery MaxiMiser and Power Management features installed, you can verify the condition of the laptop battery. You can check the status of your battery using the Battery MaxiMiser Gauge in the taskbar tray. The ThinkPad’s Lithium Ion battery pack that seems to be an intelligent battery uses a microprocessor to monitor its capacity. Then the microprocessor of the battery pack passes the information about the remaining battery capacity to the laptop. The laptop indicates the capacity with high accuracy.

Using the HP Laptop Battery Learning Utility, a modified version of a Win98 boot floppy, can also help you. Just place it in the floppy drive, and then turn on the computer. The re-calibration process is automated and takes about six hours to finish. This utility is available in different versions for different models. You can run the utility every two months.

If the laptop battery is still bad then it must have developed a memory that cannot be erased easily. If calibration doesn’t help, then it is the right time to purchase another battery.

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Toshiba announced the price and configuration of laptops belonging to the family Toshiba Portégé R800. This is a laptop designed for business users, which includes entertainment, multimedia and . Toshiba Portege R830 includes different models though, the most interesting, we point out that with Sandy Bridge processor TOSHIBA Portege R830 battery from Intel. At a cost of 889 dollars, you can buy the Toshiba Portégé R835-ST3N01 with Sandy Bridge processor 2310M, 2.1 GHz Core i3 on a Mobile Intel Express HM65.

Furthermore, the notebook has a traditional network adapter Gigabit Ethernet and 802.11b/g/n WiFi connectivity to connect to any hotspot. The power of the TOSHIBA Tecra R840 battery device is left to a Lithium-Ion 6-cell and that you do not know the independence declared is true though that the next 9 hours per charge. I believe that this is the first choice for people who often go business outside.

Toshiba Portege R830 is equipped as standard with the operating system Windows 7 Home Premium and Microsoft offers a HDMI video output for connection to high-definition televisions, a DVD burner and always useful, a multiformat card reader, USB 3.0 to high speed data transfer, Bluetooth 3.0 module to interact with TOSHIBA Satellite R630 battery compatible devices, and an integrated webcam for video conferencing. These featured design will attract you to have a try to buy it.

Among other features, the presence of a combined port eSATA / USB port for connecting external hard drives or similar devices, and Intel Wireless Display and by which you can transfer audio / video content to and from compatible device using wireless connections. Among the latest of the producer, also TOSHIBA Tecra R700 battery purchased the laptop LCD monitor with USB technology which we have discussed in this article.

Related Battery Code:TOSHIBA P000531460,TOSHIBA PABAS235,TOSHIBA PABAS236,TOSHIBA PABAS249,TOSHIBA PABAS250,

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Several press articles this past week have drawn attention to blog and forum postings by users claiming Windows 7 is warning them to “consider replacing your battery” in systems which appeared to be operating satisfactorily before upgrading to Windows 7.  These articles described posts in the support forums indicating that Windows 7 is not just warning users of failing batteries – as we designed Windows 7 to do this – but also implying Windows 7 is falsely reporting this situation or even worse, causing these batteries to fail.  To the very best of the collective ecosystem knowledge, Windows 7 is correctly warning batteries that are in fact failing and Windows 7 is neither incorrectly reporting on battery status nor in any way whatsoever causing batteries to reach this state. In every case we have been able to identify the battery being reported on was in fact in need of recommended replacement.

Using all the tools at our disposal including contacting customers reporting this issue on forums, customer service communications, partnerships with our PC makers, and of course the telemetry in Windows 7, we have been monitoring reports and discussions regarding this new feature, trying to separate reports of the designed behavior from those that might indicate an issue with Windows 7.  In the latter cases we are trying to understand the scope of applicability and obtain hardware on which to reproduce a faulty behavior.   To date all such steps indicate that we do have customers seeing reports of battery health issues and in all cases we have investigated Windows 7 has simply accurately detected a failing battery.   Before I go into our status on this particular issue, we should review the details behind this new feature.

One of the most obvious components of PC battery life (the runtime you get on battery power) is the battery itself. PC batteries inherently degrade in their ability to hold a charge and provide power (as is the case for all rechargeable batteries). The cause of this is complex and includes irreversible changes in battery chemistry, and increased internal resistance among other things and those in turn are dependent on the design and manufacturing of the battery. This degradation translates into less battery life for the user over the life of the battery in the PC.  Ultimately, batteries must be replaced to restore an acceptable battery life.  A quick check of mainstream laptops will show that batteries usually have a warranty of 12 months, which is about the length of time when statistically we expect to see noticeable degradation (meaning that you start to notice the need to charge more frequently). Those of us that have owned the same laptop (or mobile phone, or music player, or anything else with rechargeable batteries) for a couple of years and taken it through regular charge cycles have no doubt “felt” the decline in battery life though we might have attributed to any number of factors since we did not have any information available to us otherwise.

Windows 7 makes use of a feature of modern laptop batteries which have circuitry and  firmware that can report to Windows the overall health of the battery. This is reported in absolute terms as Watt-hours (W-hr) power capacity. Windows 7 then does a simple calculation to determine a percentage of degradation from the original design capacity. In Windows 7 we set a threshold of 60% degradation (that is the battery is performing at 40% of its designed capacity) and in reading this Windows 7 reports the status to you.  At this point, for example, a battery that originally delivered 5 hours of charge now delivers, on average, approximately 2 hours of charge.  The Windows 7 the notification is a battery meter icon and notification with a message “Consider replacing your battery”.  This notification is new to Windows 7 and not available in Windows Vista or Windows XP.

PC batteries expose information about battery capacity and health through the system firmware (or BIOS).  There is a detailed specification for the firmware interface (ACPI), but at the most basic level, the hardware platform and firmware provide a number of read-only fields that describe the battery and its status.  The firmware provides information on the battery including manufacturer, serial number, design capacity and last full charge capacity.  The last two pieces of information—design capacity and last full charge capacity—are the information Windows 7 uses to determine how much the battery has naturally degraded.   This information is read-only and there is no way for Windows 7 or any other OS to write, set or configure battery status information.  In fact all of the battery actions of charging and discharging are completely controlled by the battery hardware.  Windows only reports the battery information it reads from the system firmware. Some reports erroneously claimed Windows was modifying this information, which is definitely not possible.

As mentioned, every single indication we have regarding the reports we’ve seen are simply Windows 7 reporting the state of the battery using this new feature and we’re simply seeing batteries that are not performing above the designated threshold. Below we’ll talk about the data we have to support this point of view. It should stand to reason that some customers would be surprised to see this warning after upgrading a PC that was previously operating fine. Essentially the battery was degrading but it was not evident to the customer until Windows 7 made this information available. We recognize that this has the appearance of Windows 7 “causing” the change in performance, but in reality all Windows 7 did was report what was already the case.

The following data points contributed to our understanding of the reports we are seeing. Please keep in mind that all the telemetry we see is opt-in, anonymous, and respects our privacy policy.

• We have seen no reproducible reports of this notification on new hardware or newly purchased PCs. While we’ve seen the reports of new PCs receiving this notification, in all cases we have established that the battery was in a degraded state.
• Our OEM partners have utilized their telemetry (call center, support forums, etc.) and have let us know that they are seeing no activity beyond what they expect. It is worth noting that PC manufacturers work through battery issues with customers and have a clear view of what is to be expected both in general and with respect to specific models, timelines, and batteries.
• We’ve gone through all the major online support and self-help forums and when appropriate have worked to follow up with any reports of this notification being presented in error. Through this we have identified no reproducible cases where the battery or PC was new and have only learned of batteries that were degraded in capacity.
• In our telemetry from RTM code customers, only a very small percentage of users are receiving the “Consider replacing your battery” notification, and as expected, we are seeing systems older than ~1.5 years.  We’re seeing relatively fewer notifications compared to pre-release software as the average age of the system decreases.
• Microsoft has received 12 customer service incidents in addition to pulling 8 additional incidents from various forums. To date (for a total of 20 incidents), none of these have shown anything other than degraded batteries.
• Microsoft has been using the technet community moderators to assist in further contacting customers reporting on this notification and we’ve assigned additional customer service personnel to be ready. However, of the 30 or so contacts we have received we have not learned of any new facts or conditions with respect to this notice.
• During pre-release testing of Windows 7 we saw almost precisely this same experience with customers in terms of the display of the notification. In fact, in looking at the hardware distribution of pre-release testing we saw an ever so slightly higher number of systems receiving this notice. This follows from the fact that a large set of customers are buying Windows 7 with new PCs or using the upgrade provided with a recent Windows Vista PC.
• When looking at the telemetry reports for the machines that have reported displaying this notification we have seen nothing in additional reliability data that indicates any other system anomalies.
• While the information regarding battery status is provided read-only to the operating system through ACPI, we performed a thorough code-review and verified that there exists no code that is capable of modifying battery status information.

This data would confirm our point of view that we are seeing nothing more than the normal course of battery degradation over time. The transparency provided in this new Windows 7 feature produced a notice that previously was not available to customers and did so shortly after upgrade. This is the root cause of the urgency with which we’ve seen postings, but does not change the reality of the condition of the battery. We have no confirmed cases of new machines with the as-purchased batteries.

As we always say with regards to any reports on the quality of Windows 7, we are going to continue to be diligent and use all the tools at our disposal to get to the bottom of a report that has the potential to require a code change we would distribute to customers. We are as certain as we can be that we have addressed the root cause and concerns of this report, but we will continue to monitor the situation. In particular, we will continue to have focused communication with our OEM partners as they monitor their customers and PCs over time.

consider replacing your battery at: http://www.battery-center.net/

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The Latitude E5520, Dell’s third option is ideal for professionals looking for a mix of budget, ease of use, mobile and desktop computing. With a Tri-Metal rugged design, this notebook is available with two screen options: an LED antiglare widescreen 15.6-inch high-definition and a 15.6-inch, but FHD. It also comes with a backlit keyboard for work in low lighting, and you can select the HP Mini 311C battery cells in the lithium ion battery 4, 6 or 9 cells, with fast recharge Express-Charge.

HP and its options the hp envy 14 is a powerful portable players, with a 14.5 inch screen Radiance LED backlight with a resolution of 1,600 by 900, a graphics card ATI Radeon HD 5650 to play and watch videos and pictures 3D and comes standard with and dual-core processor Intel Core i3 370M, and HP Pavilion DM1 battery is available on models with Intel Core i7 quad-core 840m as the most advanced.

With dimensions of 14.01 by 9.33 by 1.11 inches and weighs 5.57 pounds, the ENVY 14 comes with a backlit keyboard, an optical drive slot-loading a web camera high definition (HD) HP TrueVision, a mini DisplayPort connector and the latest wireless connectivity. The HP Pavilion dm1-1000 battery ENVY 14 is driven by a hybrid graphics card, which includes the Intel GMA HD for everyday use, and the ATI Radeon HD 5650 for gaming.

Also, the notebook includes Beats Audio, a performance technology developed by HP and Beats by Dr. Dre, to provide the best listening experience when playing music or audio through headphones or external speakers. The with up to 6 hours, as specified by the manufacturer have enough time to enjoy HP Pavilion dm1-2000 battery a movie on a flight of average length, surf the web or take notes in a long meeting. The laptop is sold with a two year warranty.

Dm1 Pavilion. Ideal for the mobile user, the thin and light HP Pavilion dm1 offers the performance of a laptop in a compact and modern design, inspired by the culture, art and fashion. It builds on the design philosophy MUSE (materials, use, sensory experience) of HP. has less than HP Pavilion dm1-2100 battery an inch thick and a screen in High Definition BrightView 11.6-inch diagonal HP CoolSense incorporates technology that combines advanced hardware and intelligent software that cooling is noticeably cooler.

This technology automatically adjusts the cooling levels according to user’s personal preferences. Has incorporated the latest technology VISION AMD-powered by AMD Accelerated Processing Unit Fusion, which integrates a general processing unit with for Microsoft DirectX 11 on the main HP Pavilion DM2 battery processor, which gives the user a great viewing experience with HD resolution 1080p. , and Dolby Advanced Audio for playback of movies, music and games are some other features.

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Adorned with a bright Asus logo, the tower adopts a monolithic design rather original. In terms of configuration, there is no need to spread since it will depend on possible distributors or resellers ASUS A6000 battery based on their desire and the price range mentioned. For, Asus presents its new laptop range Republic of Gamers. This is the G74S Series, replacing the G73, again with a 17-inch matte slab.

With Windows 7, a Blu-ray and an Intel Core i7 2630QM, the beast can be equipped with up to 16 GB of RAM, a hard disk or a Momentus XT RAID 2×500 GB example. The frame ASUS B43 battery has changed somewhat in terms of design with new, easy access to hard disk and memory and a keyboard arrows well separated and of course backlit. A new cooling system would also present.

Finally note another important novelty is the graphics card. GeForce GTX 560M which will be formalized soon by NVIDIA. The manufacturer should also offer new standards in the notebook segment, with revised chassis and some new functional sometimes leave a. Thus, some frames are equipped with ASUS P30 battery the technology Palm Cool, which ensures that wrist rests do not burn, then found a touchpad on other Palm Proof.

The Palm Proof must not be sensitive to accidental movement of the palm of your hand, demonstration that did not work during our test stand. Asus also had the N55, a laptop pretty original design, an embedded speaker system validated by. Unfortunately we were not allowed to take pictures. Note however that ASUS V6 battery it will have an additional subwoofer, the latter of course being self-powered and very compact because the size of a pack of cigarettes.

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