Horrible battery life iPhone 6s on iOS 12
I have a 6s with a relatively new battery (was replaced last year under warranty and capacity is at 96%). The battery life is absolutely horrendous now and I can never make it through a day without fully recharging. While using something like Safari, I can watch the battery percentage drop like 5% in a minute. Sometimes unlocking my phone and replying to one text message uses 3-5% battery. Today, I was playing Pokemon Go with my son and it dropped 9% in ONE BLOCK. We played for 20 minutes and I lost 48% battery. I was at one hour of screen on time total for the day then and was at 23% battery.
This has been happening ever since iOS 11. I took my phone in to Apple a while back and they told me diagnostics were all fine. Battery life on iOS 10 was actually pretty good, but now this is the worst battery I’ve ever had on any phone.
What the hell is going on? Is there any way to fix it?