Battery life draining

[CptNick]

I have a samsung galaxy s4. I used to be able to play games like coc while charging and my battery percentage always goes up. Lately, when I even play a simple hame like unblock, my battery goes down. What is happening and how do I fix it? Thx

 

[ssundaybay]

Looks like it’s high time to change either a charger or a battery. S4 is not the newest device.