Posts Tagged ‘capacity’

Show battery capacity for notebooks on Windows

Friday, April 20, 2012 posted by CSch

Notebook batteries lose part of their capacity over time depending on their treatment. To see at how much maximum capacity your battery it, there is a command line tool that you can use from an elevated command line. To open such, search your main menu for cmd, right-click it and choose Run as administrator. In the command line, enter following:

powercfg -energy

The tool will then observe the system for 60 seconds and will then save an energy report in the default location if not specified otherwise, which is C:\Windows\System32\. You will not be able to open from there so just drag and drop it to the desktop or some other none-system folder. Somewhere near the middle of the document you will find the battery information. Mine look like this:

Battery:Battery Information
Battery ID 206SANYODell
Manufacturer SANYO
Serial Number 206
Chemistry LION
Long Term 1
Design Capacity 93240
Last Full Charge 85892

The ratio of the last two values is the current capacity of your battery:
85892 / 93240 = 0,921
which is about 92% capacity.