I am not responsible if your devices send you back in time, explodes, implodes, bricks or flies into space from the use of any software I put up.


Saturday, October 23, 2010

Checking Battery Capacity in Windows 7

Alternatively there is a Free software to measure power consumption by Microsoft Research.
It is called JouleMeter.
Find out more about it here.

A new feature in Windows 7 is the ability to check battery capacity.
Take a look at the following:

Open a Command Prompt Windows with Administrative Permission
powercfg /Energy

It will create a report in

There is one line like this
Battery:Battery Information
Battery ID 11121SANYOAS07A31
Manufacturer SANYO
Serial Number 11121
Chemistry LION
Long Term 1
Design Capacity 48840
Last Full Charge 41214
The amount of battery life left can be calculated by
eg. 41214/48840*100
Formula:  (Last Full Charge)/(Design Capacity) * 100
Which equates to 84.38% meaning my laptop battery has only 84.38% of charge left (because I didn't take good care of it. There was a few times when the battery was almost fully drain)

So make sure you switch off the laptop or connect it to an AC outlet when battery life reaches 10% and do not expose it to high temperatures.

Alternatively you can download the new HWMonitor as it reports the charge capacity directly.


Jake said...

Great tip. Thanks! avoids having to download software for this...

Anonymous said...

Thanks for the tip. Mine is at 73% capacity...!

xellex said...

Hello amin,

How can I calibrate my li-ion battery... is there a way? please help.. thank in advance...

Haritha said...

Hi, I have xp installed. How do we get battery information in xp?