Longer storage of the device
Before prolonged storage, the unit should be fully charged and the battery disconnect plug disconnected. Because batteries self-discharge over time, and deep discharge will cause irreparable damage, so recharge the device every 4-6 months.
Inadvertent deep discharge due to non-use and non-charging is the reason for 95% of all battery defects. This device and its batteries will last the longest if you use it often.