After installing iOS 26 Developer Beta on my iPhone 13 mini, I encountered a critical battery issue. The battery percentage was stuck at 1%, and the phone could only be used while continuously plugged in.
Despite the low reading, the device remained fully functional — I could use apps, navigate, and perform tasks normally. However, the battery indicator never rose above 1%, and the Battery Health section in Settings showed 0% Maximum Capacity, which is inaccurate.
I did not allow the phone to fully discharge, out of fear that it might not turn back on. Restarting the phone and changing cables or chargers had no effect. After restoring the device to iOS 18.7.2 using DFU mode, the issue disappeared entirely — the battery percentage behaved normally again and the health section showed the correct value (about 100%).
Observed behavior:
• Battery percentage frozen at 1% • Maximum Capacity reported as 0% • Device only functional while connected to power • Issue resolved immediately after restoring to iOS 18
Temporary solution: A DFU restore to iOS 18 (18.5 22F76) immediately resolved the issue. The battery percentage and health readings returned to normal.
Additional information:
• Charger used: Official Apple 20W USB-C charger • Cable used: Apple USB-C to Lightning cable • Battery health after restore: 100% (replaced)
