What should I do if the P20 will not be used for a long time?
Turn off the power after it is fully charged and place it in a dry and cool environment. Charge it every three months to avoid irreversible damage to the battery. If unused for an extended period, disconnect the robot from the power supply. (Pages 3, 7)
From the official Airrobo P20 Robot Vacuum Cleaner manual, page 7
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