Battery issue Galaxy Tab 3

A

AC Question

I have been experiencing an issue with my Tab battery % display for a couple of months now. One day, it simply started draining the battery after minutes of turning it on. When I leave it on with no use and come after an hour, it does show the real % but after minutes it goes down again.
Originally, the battery lasted for three days with no problem, but now, despite lasting the same amount of time in use, it shows 1% battery after only 20 min and shows the real % after resting for a while.
I have made a soft reset, a hard reset and the problem continues, which is annoying due to the fact it lowers the screen brightness and I can hardly see anything.
I really think is a software problem since the battery continues to last a long time in use, it's only that it displays an unreal %
Any ideas? I'd really appreciate some help.
 

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