About this replacement
Motorola Moto G52 / G82 Series — 3.87V Li-Polymer Replacement Battery (NE50)
This is a 3.87V, 4900mAh Li-Polymer replacement cell for the Motorola Moto G52, Moto G82, and Moto G82 5G. It carries the OEM part number NE50 and fits the same connector and BMS handshake as the factory cell. Capacity is 18.96Wh, matching the original specification exactly.
- G52 and G82 platform compatibility: Both the G52 and G82 share the NE50 footprint, voltage rail, and BMS communication protocol. The connector orientation and cell dimensions — 80.70 × 63.75 × 5.10mm — are identical across the line, so one cell covers the full series without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a G52 unit. The BMS accepted the cell without error flags, charge termination triggered correctly at 4.35V, and the protection circuit tripped as expected under overcurrent load.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC on the G52 and G82 is calibrated to the old cell's discharge curve. Running one slow cycle first lets the coulomb counter reset against the new cell before high-current charging begins.
Sudden shutdown at 20–30% on the Moto G52 after a cell swap
The G52's fuel gauge IC uses a stored discharge curve from the original cell to predict remaining capacity. When a new cell goes in, that curve no longer matches the actual voltage-versus-capacity relationship of the fresh chemistry. Under peak load — 5G modem bursts, screen-on at full brightness — the cell voltage dips faster than the IC expects, and the phone interprets a brief voltage sag as a critically low state and shuts down. One full slow discharge to 0% followed by an uninterrupted charge to 100% forces the IC to relearn the curve. After that cycle, shutdowns at 20–30% typically stop.
Phone won't power on after the replacement cell sat in storage
Li-Polymer cells self-discharge in storage. If the NE50 cell drops below approximately 2.5V per cell during shipping or storage, the BMS enters a lockout state and blocks current flow to protect against reverse-polarity charging of a deeply discharged cell. The phone shows nothing on screen — no charging indicator, no vibration. Connect the phone to a wall adapter rated at least 10W and leave it untouched for 20–30 minutes. The BMS trickle-charges the cell back above its recovery threshold, typically around 2.8V, before allowing normal charge current and boot.