Battery is draining fastly

@jeyarajend33237 this "if I am playing games" is the most power draining task on a cellphone. There maybe nothing wrong with your battery other then that the game playing depletes it faster. You need to let us know how long the battery last when you do not play games.

If it is still the original battery then you can always go ahead and replace the battery since it will be normal for a battery to degrade over a few years. Since iFixit does not yet have the guides for that, I suggest you use this one for the battery It was written in Spanish so use a browser that does the translating for you, if needed.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!