About this replacement
Motorola One Fusion Plus / XT2067 — 3.8V Li-Polymer Replacement Battery (LG50)
This 3.8V 4900mAh Li-Polymer cell replaces the original LG50 battery in the Motorola One Fusion Plus (XT2067). It fits the factory battery slot and connects to the same BMS contacts the phone's charge IC expects. Capacity is rated at 18.62Wh — matched to the product data, not a web estimate.
- One Fusion Plus / XT2067 fit: Both model names refer to the same hardware revision. The LG50 cell uses a single flat connector that locks into the board-side ZIF socket — no adapter or pin modification needed.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the XT2067 board. The charge IC accepted the BMS handshake on the first cycle, and the coulomb counter began tracking state-of-charge within the first full discharge pass.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current fast charging pushes energy into an uncalibrated counter — avoiding erratic percentage readings from the start.
Sudden shutdown at 20–30% on the replacement LG50 cell
The One Fusion Plus runs a Snapdragon 730 with a high-resolution display — both pull significant current spikes under load. A new cell that hasn't completed its first full cycle can show a voltage cliff earlier than expected, where terminal voltage drops below the BMS cutoff threshold even though the fuel gauge still reads 20–30%. This is a calibration gap, not a faulty cell. Run one full discharge to below 5% without fast charging, then charge to 100% — the coulomb counter resets against real cell data and the false cutoff disappears.
USB-PD fast charge not triggering after cell replacement
After swapping the LG50, some users find the phone charges at standard rate even with a fast-charge adapter. The charge IC on the XT2067 performs a BMS negotiation check on the first post-swap charge cycle — if cell impedance reads outside an expected window on a cold or uncycled cell, the IC drops back to 5V standard charging as a precaution. Plug in the phone and let it complete one full standard charge to 100%. On the second charge cycle, fast charging resumes once the IC has a confirmed impedance baseline from the new cell.