About this replacement
Motorola Edge 30 Ultra — 3.89V Li-Polymer Replacement Battery (NF45 120W)
This is a 3.89V, 4450mAh Li-Polymer cell for the Motorola Edge 30 Ultra (120W), Moto X30 Pro (120W), XT-2201, and XT2241-1. It slots into the original battery bay and connects to the same flex ribbon as the factory cell. Capacity figures come from the product data — 17.31Wh at rated voltage.
- XT2201 and XT2241-1 platform fit: These model numbers share the same physical cell dimensions (83.40 × 63.40 × 5.30mm), the same 3.89V nominal rail, and the same BMS communication handshake with the PMIC. One cell SKU covers both variants because the charge IC doesn't distinguish between them at the hardware level.
- Bench tested on actual hardware: We ran this cell through charge and discharge on a bench unit matching the XT2241-1 platform. The BMS accepted the cell without rejection flags, the PMIC negotiated the 120W charge path correctly after the first calibration cycle, and the protection circuit tripped at expected cutoff voltages.
- First-cycle fast-charge hold: On first use after installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve. Running a full slow cycle first lets the coulomb counter map the new cell before 120W high-current charging pushes into an uncalibrated state.
Sudden shutdown at 20–30% on the replacement cell
The Edge 30 Ultra's modem and display draw spike current simultaneously during 5G handoffs and high-brightness screen events. If the fuel gauge IC hasn't completed a full calibration cycle against the new cell's discharge curve, it misreads remaining capacity. The cell voltage drops below the PMIC's cutoff threshold under load — even though the reported percentage looks safe. One full slow discharge to 0% and a complete charge to 100% before returning to normal use resets the coulomb counter reference.
Phone reports wrong battery percentage after the cell swap
The fuel gauge IC stores a learned model of the old cell's internal resistance and voltage-to-capacity curve. A new cell has different impedance characteristics, so the existing model produces inaccurate percentage readings — often showing 100% too quickly or dropping erratically under load. The fix is a full calibration cycle: run the phone down until it shuts off automatically, then charge uninterrupted to 100% with fast charging disabled. After that single cycle, the coulomb counter re-anchors to 3.89V nominal and the readings stabilise.