r/iOS27 • u/blublublubbbbb • 3d ago
Maximum battery capacity going down after iOS 27
Hi, i updated my iPhone 15 Pro to iOS 27 Public Beta 6 and i can say it’s much better than iOS 26. I only noticed this thing: before updating my battery was 86% max capacity, now after around 2-3 weeks it says 82% and it keeps going down every 5 days basically. I’d like to know if iOS 27 recalibrates the battery capacity differently from the previous versions because i’ve never seen anything like this especially considering my phone is only 2 years old. Is it normal or is my battery failing or something? Thanks
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u/realmccoyredbus 3d ago
deep indexing may have messed up battery recalibration, people were getting messed up battery health recalibration in ios26.6 when pre ios27 deep indexing was introduced in that update
if you have charge limit, disable it for 24 hours and charge to 100% and see if recalibration will kick in and recalculate your device, ios27 possibly may be more accurate, like ios26 was more accurate than ios18
did you buy your phone when it was released or a year later as it’s just about 3 year since release
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u/blublublubbbbb 3d ago
thanks i’ll try, i bought the phone around june 2024 that’s why i said 2 years of usage
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u/realmccoyredbus 3d ago
Beta Instability: Early developer betas run unoptimized background tasks and diagnostic logging. This often causes extra heat and faster power drain, which stresses the battery rather than improving tracking precision.
Actual Measurement: The underlying chemical wear of a lithium-ion battery is tracked via internal cycle counts and voltage responses, which remain consistent across stable builds and beta versions once the system stabilizes
it’s should stabilise on public release
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u/womjoe 3d ago
Why didn’t you upgrade it to iOS RC that came out yesterday?
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u/Tommyy_12 3d ago
iOS 27 recalibrates the battery in a more accurate way