Why is my battery draining abnormally fast when it drops to 20%?

[AC Question]

When i'm using my phone with like 100% battery, it drains normally like 1% per 10mins but when it drops to 20% it drains pretty fast like approximately 1% per 5 seconds. I'm using Samsung Galaxy Grand Neo.

 

[Golfdriver97]

Welcome to the forums. It may be possible that the OS is constantly recalculating how much time you have left.

However, I would also suggest recharging between 30-40% remaining.

http://forums.androidcentral.com/ambassador-guides-tips-how-s/479461-guide-my-battery-shot.html