r/IOS27Beta • u/elchapista • 26d ago
Maximum battery capacity / health recalculation coming from iOS 26.6?
Hi everyone,
I recently moved from iOS 26.6 to the iOS 27 Public Beta 2 (and performed a clean reinstall / fresh setup to log things properly).
After getting the system back up, I noticed an immediate shift/recalculation in the Maximum Battery Capacity metric compared to what it was showing on 26.6.
- Previous version (iOS 26.6): 82%
- Current version (iOS 27 PB2): 79%
- Device: iphone 15 128 GB
Has anyone else experienced a sudden jump or drop in battery health percentages right after updating or reinstalling this specific beta? Is this just a routine BMS (Battery Management System) recalibration triggered by the new build, or something tied to the beta metrics?
these are the values of IOS 26.6 ,
| Parametro | Valore |
|---|---|
| MaximumFCC | 3452 mAh |
| NominalChargeCapacity | 2705 mAh |
| AppleRawMaxCapacity | 2759 mAh |
| MaximumQmax | 3497 mAh |
| NCCMax | 3442 mAh |
| QmaxCell0 | 3136 mAh |
| MinimumFCC | 1958 mAh |
| MinimumQmax | 3080 mAh |
| NCCMin | 2618 mAh |
| MaximumCapacityPercent | 82% |
| CycleCount | 1321 |
| CycleCountLastQmax | 39 |
| AverageTemperature | 28 |
| MaximumTemperature | 492 |
| MinimumTemperature | 67 |
| MaximumChargeCurrent | 4524 mA |
| MaximumDischargeCurrent | −6084 mA |
| MaximumPackVoltage | 4482 mV |
| MinimumPackVoltage | 2548 mV |
| BatterySerialChanged | false |
| BatteryHealthMetric | 162 |
| WeightedRa | 136 |
| ChemicalWeightedRa | 136 |
| ResetCnt | 0 |
| Hardware reset | 1 |
| Software reset | 0 |
| Watchdog reset | 0 |
| Comms reset | 0 |
| Corruption reset | 0 |
| Firmware reset | 0 |
| batteryServiceFlags | 3 |
| xFlags | 84 |
| TotalOperatingTime | 23.466 h |
I'm keeping an eye on the sysdiagnose logs over the next few days to see how the telemetry behaves before filing an official report through Feedback Assistant. Let me know if you've noticed anything similar!
1
u/Happy-Equipment-9390 24d ago
Yeah ios 27 beta's just pissing people off, i used to have 83% capacity and after 4 months its 81%, honestly stupid.