About this replacement
Apple iPhone 13 Mini — 3.85V Li-Polymer Replacement Battery (A2660)
This 3.85V Li-Polymer cell replaces the original A2660 battery in the iPhone 13 Mini and iPhone 13 Mini 5G. Capacity is 2350mAh (9.05Wh), matching the stock cell specification. Fits models A2630 and the full iPhone 13 Mini lineup.
- iPhone 13 Mini and 13 Mini 5G fit: Both variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The A2660 part number covers the entire 13 Mini range — no hardware differences between the standard and 5G models affect battery fitment.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an iPhone 13 Mini. The BMS accepted the cell without fault flags, fuel gauge IC initialised correctly, and charge termination triggered at the expected cutoff voltage.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes amperage into an uncalibrated coulomb counter — preventing erratic percentage readings early on.
Sudden shutdown at 20–30% on a replacement cell
A new Li-Polymer cell has a steeper voltage cliff than a broken-in cell. When the modem fires at full power — during a call or in a weak signal area — current draw spikes hard. If the fuel gauge IC is still calibrated to the old cell's curve, it reads 25% remaining while the actual cell voltage has already dropped below the BMS cutoff threshold. The phone shuts off to protect the cell. Run one complete discharge to roughly 1% and a full uninterrupted charge cycle to let the coulomb counter reset against the new cell's actual voltage profile.
USB-PD fast charge not accepted on first cycle after replacement
On the first charge after a cell swap, the charge IC may default to standard 5W input and refuse to negotiate fast charge. This happens because the BMS reports an unverified cell state on initial power-up, and the charge controller limits current until it has a confirmed reading. Plug into a USB-PD charger and allow the first full charge to complete without interruption. Fast charge handshake typically activates normally from the second cycle onward.