Battery draining 60% in less than 1 hour
I replaced my iPhone 6 battery 5 months ago and then I barely used it for 20 days because I used my spare iPhone 8 Plus and used iPhone 6 after 3 months it draining so fast I do all stuff like turn off backgrounds app refresh, reset all Settings, brightness level zero , no sim card insert in i only have only 2 apps in iphone YouTube and goggle maps that it warranty of battery expired because I got 3 months warranty only so what to do please suggest me when I got this iPhone 2.5 years ago I used it full day and then charge it but now I charge it after 1 hour I repeat charging it ? Please suggest why this happen battery health is 100%
iPhone 6, iOS 12