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Are you absolutely sure that the battery is fully charged? How old is it? Batteries do wear out and it is not uncommon for you to get a fully charged indication when in fact the battery is bogus. Use tablet just with adapter. If it stays on then it is definitely the battery. If it also turns off then you have a serious issue with your tablet.
What is the device, and how do you know its fully charged? =========================== Typcially an android device will require you hold the power for upwards of 10-12 seconds fully to force a reboot. If you do that, and its unable to start/respond at all, then I would likely think you have a button issue, or a false positive with the battery/charging on the logic board. Unfortunately, the later means likely, replacing the tablet
This can happen after you restart the tablet or after downloading something. The OS get messed up. Turn off the tablet completely, not just put to sleep. Leave it off for several minutes so the RAM will clear completely (normally takes less than a minute). If that does not work, leave the tablet on (It can go to sleep and that's fine.) until the battery drains to zero. Then charge fully and you should be good to go. Worked for me.
Your tablet may need its battery calibrating. To do this run your tablet until it turns itself off, this will ensure that there is no charge left in the battery. Then leave it on charge until the battery is full. Normal battery use on modern devices like tablets and phones should be between 25-75%, with a calibration once every 3-6 months to ensure a good battery lifespan. If this solution does not work you may need to replace the battery.
First try and hold the power button down until it switches off and then turn it back on and see if you can unlock it.
If you can't unlock it then you can do a recovery this is how
when it is switched off hold the volume up and the hold the power button until you see a recovery screen with options there you will see a option to recover.
Try cleaning the touch-screen with a tissue or touch-screen cleaning paper, then wash your hands and use a skin moisturizer on your fingertips. If it still doesn't work, something's wrong with the unit. The touch-screen should work down to the discharge limit of the battery.
Note: when you buy a new lithium battery or device that uses one, it is a good idea to charge it completely before using. Some types of battery charge controllers use this first cycle to calibrate battery parameters so you get optimum performance from the battery.
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