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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.

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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
Enter:
powercfg /Energy

It will create a report in
C:\Windows\system32\energy-report.html

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.

4 comments:

Jake said...

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

asdf 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?