Here is what I have seen with mine. I only use Android. Even when the battery is at 100% if I shutdown in the normal way my battery will be completely dead a short time later. I don't know what the shortest time is, but it has happened even in only 2-3 hours of being shutdown. I cannot turn it on and even if I attach the charging cable I have to wait awhile before I can turn it on. If I put it to sleep instead of shutting down the battery will last much longer and be okay hours later. What is going on? Why would the battery totally discharge after the tablet is shutdown and turned off?