Apple iPhone Xs Replacement Battery 616-00514 3.8V 2950mAh

Apple iPhone Xs — 3.8V Li-Polymer Replacement Battery (616-00514)

This is a 3.8V, 2950mAh Li-Polymer battery for the Apple iPhone Xs, covering models A1920, A2097, and related variants. It replaces the original cell when the phone no longer holds charge through a normal day or shuts down unexpectedly. Capacity matches OEM spec at 11.21Wh.

• iPhone Xs and A-series variants: The A1920 and A2097 share the same battery footprint, connector pinout, and BMS handshake protocol. One cell fits all listed variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on an iPhone Xs logic board. The BMS accepted the cell, charge IC engaged correctly, and the fuel gauge IC registered capacity without fault codes.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC is still running the discharge curve it learned from the degraded original cell. When the new cell hits a voltage point the IC associates with 20–30%, it signals a low-voltage cutoff even though capacity remains. The fix is one full discharge-to-shutoff followed by an uninterrupted charge to 100% with the phone off or in airplane mode. After that cycle, the coulomb counter resets against the new cell's actual curve.

USB-PD fast charge not activating on the first cycle after swap

On the first charge after installation, the charge IC may fall back to standard 5W input instead of negotiating USB-PD. This is normal — the BMS on a new cell applies a conditioning current on the first cycle before it clears for high-rate charging. Plug in, let the phone charge fully without interruption, and fast charge will negotiate correctly from the second cycle onward. If it still does not fast charge after two full cycles, check that the cable supports USB-PD at 9V.