Laptop batteries can last a year to several years based on usage, and if you’re always on the go, you may not be able to tell if you’re not getting the life out of your laptop battery the way you used to. You can get information on your laptop battery health by running a command at the command prompt:

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Windows 7

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Click Start button and type cmd in the Search programs and files box
Right click on cmd.exe listed at the top of the Start menu and click Run as administrator

Next type powercfg -energy in the command prompt and press Enter

This will generate a report called energy-report.html located in the Windows\system32 folder on your C: drive. Open and scroll down to the Battery Information section:

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Windows 8 and 10

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Click Start button and type cmd into the dialog box and hit enter.
Next, type powercfg /batteryreport and hit enter.

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This will generate a report called battery-report.html located in the Users\Your Username folder on your C: drive. Open and scroll down to the Battery Information section:

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This report will give you a lot of stats, but the one you want to pay the most attention to is the Design Capacity versus the Full Charge Capacity: