About this replacement
ZTE Axon 10 Pro — 3.85V Li-Polymer Replacement Battery (Li3939T44P8h756547)
This is a 3.85V, 3900mAh (15.02Wh) Li-Polymer replacement battery for the ZTE Axon 10 Pro. It fits the A2020, A2020N2, and Axon 10 Pro 5G variants. Swap it in when the original cell can no longer hold a charge through a full day of use.
- A2020 and A2020N2 compatibility: Both the standard and 5G variants of the Axon 10 Pro share the same battery bay dimensions, connector pinout, and BMS handshake protocol — all four fit models accept this cell without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Axon 10 Pro platform. The BMS handshake initialised correctly, charge current stepped down as expected near full capacity, and no thermal flags triggered during the test sequence.
- First-cycle fast charge behaviour: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated cell.
Sudden shutdown at 20–30% on the Axon 10 Pro after a cell swap
A fresh Li-Polymer cell has a steeper voltage-discharge curve than a worn original. The Axon 10 Pro's fuel gauge IC is still calibrated to the old cell's curve, so it misreads the remaining charge. Under sustained load from the modem or display, the new cell's voltage drops below the shutdown threshold before the OS registers 0%. Run one full discharge to auto-shutdown followed by an uninterrupted charge to 100% to let the coulomb counter reset against the new curve.
USB-PD fast charge not activating on the first charge after replacement
On the first cycle, the charge controller may default to standard 5V/1A input while it negotiates BMS parameters with the new cell. This is normal — the handshake between the USB-PD controller and the fresh BMS can take one full charge cycle to complete. Do not interrupt the first charge. Once the cycle finishes, fast charging typically activates from the second charge onward. If it does not, confirm the charger output is at least 18W and the cable supports USB 2.0 data lines.