The purpose of this warning is to make sure Mabu’s battery doesn’t get too low. If Mabu is unplugged while awake, then she’ll let you know she was unplugged and ask you to plug her in. Mabu will not wake up to ask you to plug her in if she is unplugged while she is asleep. To avoid this warning, keep Mabu plugged in at all times. Or, if Mabu is unplugged while she is asleep, power her off correctly.