File:2025 05 13 15 19 IMG 77781-Recovered.png and IPhone 15 Pro Stuck at 1 Percent Charging and No Battery Data 0xa1 Panic Log Code: Difference between pages

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Problem description

iPhone 15 Pro that is not charging. It says it is at 1% battery level & doesn't go up. The USB meter is constantly fluctuating. When you plug in the charging cable, it pops up as 0% remaining.

It also restarts every 3 minutes due to lack of battery data. The panic log error will be 0xa1.

Even with a new battery and charging port installed, the symptoms will remain the same.

This tends to happen when the phone gets water damaged & fries the PMIC.

Symptoms

• Not Charging at 9V
• USB Meter is fluctuating
• Always reads battery at 1%
• When plugging in the charger, it says 0% remaining
• Restarts every 3 minutes
• Panic Log Error code is 0xa1 (Figure 1)

Solution

Diagnostic Steps

1. Test with known good parts. Specifically battery & charging port
2. Check the battery connector for damage. The pins should all be straight & not bent, warped or missing
3. Check the connector Diode Mode Values:
   1. ZXW Pin 1: 0.439V
      1. I2C2_SMC_CHARGER_BI_GG_SDA_1V8
   2. ZXW Pin 2: 0.548
      1. I2C2_SMC_CHARGER_TO_GG_SCL_1V8_CONN
   3. ZXW Pin 5: OL
      1. ANALOG_BATT_VCELL_NEG_CONN
   4. ZXW Pin 6: 0.505V
      1. ANALOG_BATT_VCELL_POS_CONN

         

4. Check the voltage of the battery connector pins, by connecting the board only, with charging port flex. Then plug in the charger to it & measure each pin:
   1. ZXW Pin 1: 1.5V
      1. I2C2_SMC_CHARGER_BI_GG_SDA_1V8
   2. ZXW Pin 2: 1.8V
      1. I2C2_SMC_CHARGER_TO_GG_SCL_1V8_CONN
   3. ZXW Pin 5: 0.6V
      1. ANALOG_BATT_VCELL_NEG_CONN
   4. ZXW Pin 6: 0.6V
      1. eANALOG_BATT_VCELL_POS_CONN

         

         
         

Repair Steps

If you have a bad diode mode reading or low voltage on the battery connector, it's likely PMIC that has failed.