Motorola Moto S30 Pro NP44 Compatible Battery 3.89V 4250mAh

Motorola Moto S30 Pro / XT2243-2 — 3.89V Li-Polymer Replacement Battery (NP44)

This 3.89V, 4250mAh Li-Polymer cell replaces the NP44 battery in the Motorola Moto S30 Pro (XT2243-2). It restores power capacity lost through cell aging, swelling, or accelerated capacity fade. The NP44 format is specific to this handset — the dimensions (88.50 × 62.10 × 4.30mm) and connector pinout match the original cell exactly.

• Moto S30 Pro / XT2243-2 fitment: Both model designations run the same power rail and BMS handshake. The XT2243-2 is the regional variant — same battery bay, same NP44 connector, same charge IC. No adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Moto S30 Pro platform. The BMS accepted the cell, charge termination triggered correctly at full capacity, and protection cutoffs activated at the expected low-voltage threshold.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points.

Why the Moto S30 Pro shuts down suddenly at 20–30% after a cell swap

This happens because the fuel gauge IC is still running the discharge curve calibrated to the old, degraded cell. The new cell has a steeper voltage cliff under load — when the modem transmits or the display peaks, voltage drops faster than the gauge predicts. The phone interprets that drop as a hard low-voltage event and cuts power. One full discharge-charge cycle at standard rate resets the coulomb counter and lets the gauge IC rebuild an accurate state-of-charge map against the new cell.

USB-PD fast charge not triggering on the first cycle after replacement

After a cell swap, the charge IC on the Moto S30 Pro typically begins with a trickle or standard charge rate on the first cycle — this is normal BMS behaviour on an unverified cell. USB-PD handshake negotiation may not escalate to high-current mode until the IC has confirmed cell impedance is within range. If fast charge still does not activate after one full cycle, check that the charger is a USB-PD certified unit and the cable supports the required current rating. Swap the cable first — most failures at this stage trace to the cable, not the battery.