ECOVACS DEEBOT T20 OMNI Instruction Manual page 29

Storage
If DEEBOT will not be used for a while, fully charge DEEBOT and power
OFF before storage. Charge DEEBOT every 1.5 months to prevent
battery drain.
Note:
When DEEBOT is not cleaning, it is recommended to keep DEEBOT powered
ON and charging.
29 EN