ios 14.5 battery drain
Hello, I'm using an iPhone 7+. I just bought this phone last December 2019. The battery health (maximum capacity) of my phone is 88%. When I started to update my phone to ios 14.4.2, my battery drains fast even if I am not using my phone. When ios 14.5 was released, I updated my phone to the latest version of ios. My question is, why does battery drain keeps on happening to me even if I am not using the phone? I thought ios 14.5 will fix battery drain issues.
iPhone 7 Plus, iOS 14