Is there anyone know what to do beside change battery for S6?

[Android Central Question]

IT really crazy when my battery had drain so quickly..I just used my phone not more than 2 years yet!! but when i charge it was supposed to 20% charging but when charges automatically increased to 66% and suddenly after used for 30 minutes drop back to 15% ..i believe Samsung purposely to do like that so that people able to send the phone to samsung to pay for the services and it cost damn pricey!! I was a SAMSUNG Lover but end up hate it so much!!! Samsung didnt help me instead call me to pay n pay that

 

[Tim1954]

Each battery has a finite number of cycles. Letting it get hot, go completely flat will dramatically reduce the life of your battery.
Even normal use will eventually see performance degrade over a period, in my experience, two years will show noticeable deterioration and I would get a new battery at that point. Given that the battery is obviously on its way out, I would replace before it expires at a most inconvenient time, leaving you with no phone at best, and a bricked one at worst!
This is not exclusive to any manufacturer, all batteries are in the same boat here...