User level: Level 1 (4 points)My battery health dropped to %98 after 90 cycles on iphone 17, is this normal? my friend’s iphone 16e is at %99 on 210 cycles? How it works
[Re-Titled by Moderator]
Original Title: Iphone 17 battery health
Posted on Sep 16, 2026 12:38 PM
User level: Level 10 (105,996 points)Sep 16, 2026 12:51 PM in response to Oguzzzz1
There is no such thing as "normal" when comparing Battery Health between to iPhone models. On average you would expect a 1% drop for every 50 charges cycles which would make yours "normal" when you take rounding into account for the fractional value and your friends Battery Health would not be "normal". In both cases the battery is expected to last 1000 charge cycles before it would need to be replaced and that should be done when it drops below 80%.
The drop in Battery Health is never linear, meaning some months will not drop at all and other months will drop more. The thing about averages is that they always catch up with you when evaluating a limited data set. Any past performance is not indicative of what you can expect in the future. If your friend's phone starts to see significant drops in Battery Health, that would be the average catching up with them, and I would expect they would be posting about what is causing their Battery Health to drop so fast.
Originally posted at discussions.apple.com/thread/256358395