On my flytouch I cant get the battery meter to read the battery correctly. It says 50% when fully charged ,then will jump to 100% after a half hour then after a bit will jump to maybe 72 % and count down from there. The battery fully charges and I get 2-3 hours out of a charge but the battery is not synced with the meter. I tried running the battery down to zero but when charged and I turned it on ti at 50% . I also tried 3rd party battery meters and they say the same thing as the built in battery meter. Any thoughts on a fix ??