Something is wrong with battery percentage

[Hakdgama]

I have a samsung galaxy tab e 9.6. The battery was fine, but now that battery percentage goes down very fast, but at like the last 5 percent, each percent takes like 30 min uses to go down 1 percentage. What can I do to make my battery work good again?

 

[B. Diddy]

Welcome to Android Central! Try recalibrating the battery sensor software by charging up to 100%, then using it normally until it shuts down automatically, then charge back up to 100%.