First of all I usually leave it plugged in when not in use. But when I do use it with the battery power, it can last playing a whole night while I sleep on battery power. Sometimes when it’s plugged in and I leave it for awhile (and this is rare) the battery icon shows it’s not plugged in when it is plugged in. The only way I can fix the problem is take the cord out put it back in again. My only question is, why does it do that in the first place? Is this normal?