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Help Samsung Galaxy Tab 3 7" - Battery Issue

Hi Guys,

Have a bit of an issue I need a hand with. I recently upgraded to the Samsung Galaxy Tab S2 LTE so I wanted to sell my old Tab 3, however, I seem to be having a battery issue. I reset the tablet so I could sell it, I charged it up fully (Took about 6 hours) and I then switched it off. I went to try and use it the next day and the battery had fully drained when powered off. I charged it up again and I was using it and battery decline was normal when powered on, I switched it off again at around 70% and the next day again the battery was flat.

Any ideas what the isssue is and how to go about fixing it? I have the tablet about 2 years 4 months so I am out of warranty. :(
 

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