Revive AA NiCad Batteries
Turn on your device with your charged NiCad battery installed. Check the power reading to make sure that your battery is fully charged.
Open as many applications on your device as you can. Use as much energy as quickly as possible. Watch the power indicator falling. Once it reaches a certain level your device tells you your NiCad battery needs charging. Ignore the warning.
Continue to use the device with the applications open until it turns off automatically. Although there is not enough energy to power your device and the applications, your battery is not fully discharged.
Turn on your device: There is enough power to do so. Leave your device turned on but don't open any applications. Let the remaining power drain. Eventually it will turn off automatically.
Turn your device on again: it should power up and then shut down. Your battery is fully discharged.
Charge your battery. If your battery charger has a charge regulator, set it to the lowest level. It lets the battery charge at its lowest rate. It takes some time, but it stores more energy and your battery then has greater endurance.