About this replacement
Motorola Moto G73 5G / XT2237 — 3.89V Li-Polymer Replacement Battery (PV50)
This 3.89V, 4850mAh Li-Polymer cell replaces the OEM PV50 battery in the Motorola Moto G73 5G (XT2237). It matches the original cell dimensions at 86.60 x 64.00 x 4.60mm for a direct fit within the chassis. Capacity is 18.87Wh — identical to the stock specification.
- Moto G73 5G / XT2237 fitment: Both model designations run the same power rail, connector pinout, and BMS handshake protocol, so one cell covers the full XT2237 production run regardless of regional variant.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a G73 5G unit. The BMS accepted the cell without fault codes, and the charge IC stepped through trickle, CC, and CV phases as expected.
- First-cycle fast charge protocol: On first use after installation, disable fast charging and complete one full 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 charging begins.
Sudden shutdown at 20–30% after fitting a replacement cell
The G73 5G's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell has different internal resistance and a slightly different voltage-to-capacity curve. Under modem or display load, voltage can sag below the shutdown threshold even when the OS still reports 20–30% remaining. One complete slow-rate discharge down to automatic cutoff — without fast charging — resets the coulomb counter and aligns the gauge to the replacement cell's actual curve.
USB fast charge not accepted on first cycle after installation
Some replacement cells present slightly higher impedance on the first cycle, and the G73 5G's charge controller defaults to standard 5V/1A input when it cannot confirm the cell is within expected impedance range. This is not a compatibility fault — it is a protection response. Charge once at standard rate to completion, then reconnect with your fast charger. The controller will renegotiate the USB-PD handshake and step up current delivery once the cell has been conditioned.