Find out Your Battery Efficiency of Your Laptop in Windows 7

Step 1:Go to Start Menu ---> Run Dialogue Box and type cmd

Step 2: powercfg –energy and press Enter.

Step 3: A script will run which will generate a report.

Step 4: The report will be generated as HTML file in C: Drive. Open The File


This reports shows battery ID, Manufacturer name, Chemistry, Design capacity and full charge.For Example,

Design Capacity : 6000

Last Full Charge:3500

That's mean your laptop battery has design capacity of 6000 and now it?s giving max full charge of 3500 that counts its efficiency to around 58% it has degraded around 42%.