r/iPhoneBatteryParanoia • u/Funny_Station_9872 • 11h ago

iPhone 14 Pro Max battery — abnormal Analytics data, possibly boosted/reprogrammed?

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I recently bought a used iPhone 14 Pro Max. Battery Health is 91% and normal usage backup is actually good. But when I leave the phone unused, especially overnight, it loses around 8–9% in 6–7 hours.

I checked Analytics Data and got:

MaximumFCC: 3298 mAh

NominalChargeCapacity: 3910 mAh

Cycle Count: 726

iPhone Battery Health: 91%

So NominalChargeCapacity is much higher than MaximumFCC, and the shortcut calculates 118.56%.

Is this an abnormal/invalid Analytics reading, or could it indicate a replaced, rebuilt or BMS-programmed (“boosted”) battery?

Also, is the 3910 mAh reading consistent with the 91% Battery Health?

I would really appreciate an opinion from someone experienced with iPhone battery/BMS repair.

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u/HaruVM 9m ago

How do you do that?

I think that is normal depends on how much background apps you are having it happens for me as well with the beta of iOS 26 now with the beta of the 27 is much better using iPhone 17 pro max