User level: Level 1 (12 points)I brought a iphone 17 pro in may 2026. But in October month my battery dropped 4% in 20 days. It’s now 96% . Is this normal?
Posted on Oct 25, 2026 5:49 PM
User level: Level 10 (199,348 points)Oct 25, 2026 6:11 PM in response to Tonmoyhere
Normal, not really, but things like this happen. Batteries are chemical devices and they don't pay much attention to statistics. I once had an iPhone with a battery that dropped 5% in less than a month. Then it went 3 more months without dropping at all.
Decline of the battery is not linear. Some months the battery might not decline at all, then drop 2% the next month. That is fairly normal.
You had really good luck....much better than "average" with the battery starting out, but things are averaging out now after a number of months.
A better indicator of your battery performance is the number of Charge Cycles that the battery has completed.
If you can provide us with the number of Charge Cycles that the battery has completed at this point, we can provide you with a method and formula to calculate your overall battery performance.
User level: Level 10 (233,174 points)Oct 25, 2026 6:31 PM in response to Tonmoyhere
Tonmoyhere wrote:
I brought a iphone 17 pro in may 2026. But in October month my battery dropped 4% in 20 days. It’s now 96% . Is this normal?
Without knowing the number of cycle charges, we can't really know what your battery health should be. I wrote this to help people better understand battery health decline --> Battery Health Decline - Should You Worry… - Apple Community
Originally posted at discussions.apple.com/thread/256382914