From what I understand, the battery health feature on iPhones only works with the 6 & 7 series, any model before or after is not supported. And AR doesn’t seem to be taking off either. I think I’ll wait for the next version that’ll finally incorporate Airplay 2.
So my 2 ½ year old to 6s says battery health is 91%. That seems plausible but maybe a touch generous, then this evening my phone went from 43% to shutting off within the space of 5 minutes. I didn't realize what it was at first until I plugged it in a and got the red battery. Then I got a "This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power" message. Hmmm.....
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To get battery health data, I have to plug it in to a Mac and run coconutBattery. I wish there was an iOS version.