Charge the NiCd battery. Depending on the product the battery is contained in, charging the battery may consists of attaching a charger to the electronic device or removing the battery and placing it in a NiCd battery charger. Keep the battery in the charger until it is full. Unplug all power adapters.
Turn the electronic device on. If needed, place the battery back into the electronic device prior to turning the unit on. Allow the device to run on battery power until the battery is dead or completely drained. Alternatively, some charging units have a discharge switch. If the unit has a discharge switch, flip this switch until the battery is drained. The discharge switch is more common on battery chargers for large batteries, such as those on large power tools.
Continue to repeat the charging and recharging process until it has been done three to five times, depending on the size of the battery. The reconditioning process should be completed every six months or as needed to restore lost efficiency.