The battery is stored in a flat location and away from any metal or other conductive materials.

Store the battery in a fully charged state. It is strictly forbidden to store in low battery, so it is easy to shorten the life of the battery.

When storing batteries, be sure to disconnect them from the device and disconnect their charger and load. Place it in a cool place.
*When the device using the battery does not have a circuit (or device) to prevent over-discharge, or the battery is not disconnected from the device when the battery is stored, the battery may be over-discharged and its capacity may not be restored after charging.
*If it is not stored in a lower temperature environment, its self-discharge will increase and its performance will decrease. And if they are stored in a humid place, moisture will condense on the terminals and the terminals may corrode.

Charge the battery: at least once every six months during storage below 25°C (77°F). Use the "charging method" specified in the charging method. The charge interval must be reduced to half with every 10°C (50F) temperature rise.
*Self-discharge doubles, and the temperature rises every 10°C (50F). If they are stored for a long period of time in a discharged state, their capacity may not be repairable, so store them after charging.
*If the battery is stored for a long period of time (1-2 years near room temperature), its capacity may not be fully restored. You can try charging for a longer time to activate the battery. The battery should be used as quickly as possible.
*The capacity of the battery will gradually decrease during storage.