About this replacement
Motorola Moto Edge X30 — 3.85V Li-Polymer Replacement Battery (NR50)
This is a 3.85V, 4800mAh Li-Polymer replacement battery for the Motorola Moto Edge X30, Moto Edge X30 5G 2021, and XT2201-2 smartphones. It replaces the OEM NR50 cell when the original no longer holds adequate charge or fails to power the device. Capacity is 4800mAh (18.48Wh), matching the factory specification.
- XT2201-2 / Edge X30 5G platform fit: The Edge X30 and its 5G variant share the same physical cell footprint, BMS connector pinout, and 3.85V voltage rail — the NR50 fits both without modification to the chassis or flex cable routing.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an XT2201-2 unit and confirmed BMS handshake, charge termination at 4.35V, and low-voltage cutoff activation before the modem rail dropped out.
- First-cycle fast charge protocol: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current fast charging is applied to an uncalibrated cell.
Why the Edge X30 reports wrong battery percentage after a cell swap
The Edge X30 uses a coulomb-counting fuel gauge IC that builds its charge model against the original cell's internal resistance and discharge curve. When a new cell goes in, that learned model no longer matches the physical cell. The IC is essentially reading voltage and current against the wrong reference. One full discharge down to automatic shutdown, followed by a complete charge to 100%, resets the calibration baseline and brings percentage reporting back into alignment.
Sudden shutdown at 20–30% on the new cell
This happens when the fuel gauge IC's stored discharge curve predicts usable voltage at 20–30%, but the cell's actual voltage under 5G modem or display load drops below the BMS cutoff threshold before the gauge reaches 0%. The BMS is protecting the cell correctly — the gauge is simply wrong about how much capacity remains at that voltage point. Run two full discharge-charge cycles without fast charging to let the coulomb counter resync. After the second full cycle, shutdowns at falsely high percentages should stop.