How To Check Battery Life On Windows 8
Windows 8> Get started with Windows 8 Check your mobile device’s battery health 
By: Arie Slob Like Windows 7, Windows 8 includes a command that allows you to view many details about your computer’s power usage, including details about your computer’s battery. Windows 8 commands will show you more details if you’re running on newer hardware. To generate a detailed battery report: Read: how to check battery life on windows 8 
Since we directed the command prompt to your desktop, the report will be placed on your desktop as topqa.info. Just open the report in your web browser. 
At the top of the report, as shown above, some general information about your computer is displayed, including the brand and model of your device (System Product Name), the date and BIOS version as well. as operating system version number. Another entry in this section is called Connected Standby and you can see that for this particular laptop it is listed as Unsupported. The battery report run date and time are also listed. Connected standby brings smartphone power to PC. It provides the instant on and off user experience that users expect on their phones. And just like on phones, the system stays connected allowing apps to stay fresh, up-to-date and accessible whenever the right network is available. Windows 8 only supports Connected Standby on low-powered PC platforms that meet specific Windows Certification requirements. Systems not specifically designed for Connected Standby continue to use the traditional PC power model fully supported in Windows 8. For more information, you can check out this official report from MSDN . According to Intel, the dual-core Atom Z2760 (codenamed CloverTrail) is the first Intel platform to support Connected Standby.
Battery installed
Contents
Under Installed Batteries, you will find detailed information about the battery including the model number (name), serial number, and manufacturer. Not all batteries will list all of those details. The chemistry for this battery is listed as LION (short for Lithium Ion). Next listed is Design Capacity, which represents the amount of charge the battery is designed to hold. The value is expressed in mWh (milliwatt hour). The next listed full charge capacity represents the amount of charge the battery received during its most recent full charge. You will note that over time, the Full Charge Capacity will decrease. This is normal “wear and tear” of the battery in use. Note that due to charge/discharge cycles, charge capacity sensors tend to become inaccurate over time. , nothing more than a full discharge followed by a full charge. You should calibrate your battery meter every 30 discharge cycles. Note that battery measurements are not 100% accurate and can fluctuate up and down, so if the condition of your brand new battery is more or less than 100% or if it fluctuates up and down over time (98 %, 91%, 95% , etc.), don’t worry. To calculate the health of your battery, subtract the Full Charge Capacity from the Design Capacity. Divide the resulting number by Design Capacity divided by 100. You now have a percentage where your most recent full charge was less than Design Capacity. Your battery status is 100 minus the last number. Using the data from the image above:
- 56.160 – 51.624 = 4.536
- 4.536 / (56.160/100) = 8.076
- 100 – 8,076 = 91,924
- Your battery health is at 91.924%
80% or more is considered good. I had a battery failure a few months after it tested below 45% of its design capacity (so its “health” was at 55%). I recently did a ‘stress test’ on this battery (which will show you the minimum time you can expect running the laptop at ‘full’) and it only ran for 36 minute. Compare that to 125 minutes for a new battery. So when you notice a decrease in uptime, have the battery checked, you can have a replacement ready. The last item in this section is called Number of Cycles. Cycle Count is a number that refers to the amount of battery used. A single load cycle is the cumulative use of 100% of the battery capacity. For example, discharging to 50%, fully charging, then discharging to 50% the next day would equal 1 load cycle (or 25% discharge/recharge four times). Batteries have a limited number of cycles to operate before they are considered consumed. The maximum number of cycles varies depending on a number of factors, but generally pre-2010 batteries are designed for 300-500 cycles. Newer batteries can be designed for 500-750 or in some cases even 1,000 cycles.
Recently used
In this section you will see a list of the energy states the system has gone through in the last 72 hours. The list shows the time the system started, the status of the system (Active or Paused), the power source (battery or AC), as well as the remaining capacity of the battery at the time of recording.
Battery usage
The Battery Usage section has graphs and tables that show you the date and time for each instance of when the battery was used in the last 72 hours. You can quickly see how much battery you’ve drained on a given day and how much time your system is using the battery.
Usage history
Read more: how to quit vanilla wow apprenticeship In the Usage History section, you’ll see a table showing your system power usage history on both battery and AC power. I explained Connected Standby near the top of this article. This Asus Eee computer does not support Connected Standby.
Battery capacity history
In this section you will find the charge capacity history of your system battery. This table shows both the fully charged capacity and the design of the battery, giving you a quick way to monitor the health of the battery. You will also notice that the battery indicator can fluctuate up and down over time, just keep that in mind.
Estimated battery life
The final section of the report is the battery life estimate. Here, you’ll see a table showing how long the battery can last at full charge and at its designed capacity. These estimates are based on observed drains, which is a function of your device usage patterns. While the report is generated using historical data, at the bottom of the table you will see a current Estimated Battery Life rating based on all observed drains since OS installation, here is a good indication of the health of your battery and gives you an idea of how long you can expect to run.
No battery report
If you have older hardware, you may not be able to run the powercfg command with the -batteryreport switch. When trying, you will get the cryptic error shown below: 
While the report suggests permission errors, launching from an elevated command prompt will have no effect. You will be limited to old style reporting (with limitations): 
When done, powercfg will generate a report (in html format) showing errors, warnings, etc. Since we directed the command prompt to your desktop, the report will be placed on your desktop as topqa.info. Just open the report in your web browser and scroll down to the Battery Info section. 
As you can see, this battery’s final full charge is only about 8.8% less than its designed capacity (or runs at 91.2% Health). For details on calculating your battery health, check the Installed Battery section above. For more information on Lithium-ion batteries, read How to Extend Lithium-Based Battery Life Published: May 29, 2013 Read more: how to go downhill on a cross-country skateboard
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