About this replacement
Motorola Moto G Pure (XT2163-4 / XT2163DL) — 3.85V Li-Polymer Replacement Battery (NT40)
This is a 3.85V, 3650mAh Li-Polymer replacement battery for the Motorola Moto G Pure (2021). It fits the XT2163-4 and XT2163DL variants and uses the OEM part number NT40. It restores power to a phone that no longer holds charge or fails to turn on due to a degraded cell.
- XT2163-4 and XT2163DL fit confirmation: Both variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The NT40 cell fits both without modification — no adapter, no rewiring.
- Bench tested on actual hardware: We cycled this cell on the Moto G Pure platform and confirmed the BMS accepted the charge curve without triggering overvoltage cutoff. The fuel gauge IC initialised correctly after one full discharge-charge cycle.
- Fuel gauge recalibration after install: On first use after fitting this cell, disable fast charging and run one complete discharge down to automatic shutdown, then charge to 100% on standard charge. This lets the fuel gauge IC map the new cell's discharge curve before fast charge pushes high current into an uncalibrated state.
Sudden shutdown at 20–30% on the Moto G Pure after a cell swap
This happens because the fuel gauge IC is still running the discharge curve from the old, degraded cell. When the new cell hits a voltage point the IC doesn't recognise as low, it can misreport remaining capacity by 20–30%. Under modem or display load, the cell voltage drops sharply at that point and the phone shuts down as a protection response. One full discharge-charge cycle on standard charging — no fast charge — resets the coulomb counter and aligns the IC to the new cell's actual voltage floor.
USB fast charge not activating on the first cycle after fitting the NT40
The Moto G Pure's charge IC runs a handshake with the battery BMS before allowing fast charge current. On the first cycle after fitting a new cell, the BMS may not complete that handshake until it has seen at least one full charge cycle at standard rate. If fast charging is not triggering, plug into a standard 5V charger and allow a full charge to 100%. After that cycle completes, the BMS handshake resolves and fast charge should activate on the next session.