Battery draining even if not I use

I purchased D20 Ultra robot cleaner. Its getting discharged even if not in use. The battery was 100% charged and I didn't put it to use in last 24 hours and the charging reduced to 11%. Is there something that I should be aware of or need to do to stop its battery from getting discharged.

Robot is still in standby mode even when you turn OFF the dock station. So, it consumes battery. If you want to switch off the robot, long press the power button, after you've switched off the dock.

Any other way other than long press power button?
Don't want to end up replacing power on button, please introduce option to power off from app itself. Thanks in advance.

Very poor service 😔😔

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