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
It will create a report in
There is one line like this
The amount of battery life left can be calculated byBattery:Battery Information
Battery ID 11121SANYOAS07A31 Manufacturer SANYO Serial Number 11121 Chemistry LION Long Term 1 Design Capacity 48840 Last Full Charge 41214
Formula: (Last Full Charge)/(Design Capacity) * 100Which 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.