Around that time there were a ton of battery recalls for phones nowhere near the end of their life - mine was one. I think they just got a bad batch of batteri

Around that time there were a ton of battery recalls for phones nowhere near the end of their life - mine was one. I think they just got a bad batch of batteries or were too aggressive cost optimizing and this was the fix. 5&6 era iPhones never had this problem and their batteries degraded just the same.