How to discharge a battery?
If you want a battery to discharge completely, it’s best to use a specialised charger with a refresh functionality.
Another way is to put a battery in a flashlight or other device and let it stay on until the battery is empty. Do note that we do not recommend this method, as it may cause over discharge and shorter battery life. Discharging with any device other than a specialised charger may cause irreversible damage to your batteries.
Note: all Panasonic batteries come pre-charged. Therefore, it is not necessary to discharge and recharge them before you use them.