How to Fully Discharge a Laptop Battery

Discharging the Battery Pack Disabling Hibernation To fully discharge the battery pack, disable Hibernation temporarily.

1. Select the Power Meter icon on the taskbar, or select Start > Control Panel > Performance and Maintenance > Power Options > Power Schemes
2. 
   
   Write down the 3 settings in the Plugged In column and the settings in the Running on Batteries column, so you can reset them after calibration. settings in the Running on Batteries column, so you can reset them after calibration.
3. 
   
   Select the drop-down lists and set all 6 options in both columns to Never.
4. 
   
   Select the OK button.
5. 
   
   Disconnect the notebook from the external power source, but do not turn off the notebook.
6. 
   
   Run the notebook on battery power until the battery pack is fully discharged. The battery light begins to blink when the battery pack has discharged to a low-battery condition. When the battery pack is fully discharged, the power/Standby light turns off and the notebook shuts down.