Sorry. I opened the device to use it and saw that the battery had only 7% remaining. Instead of it turning off like I expected it changed to show that it was charging via an ac connection. I did not have it plugged in at this time. I continued to use it watching videos on youtube and browsing the internet. When I was done my battery showed that it had 22%. I never plugged it in. I was wondering if that was normal. If the dock's battery normally showed as a charger rather than additional fuel if that makes sense. That was my first time letting it get that low so I don't know.