Motorola QV43 Moto Edge 50 Neo 5G Compatible Battery

Motorola Moto Edge 50 Neo 5G — 3.91V Li-Polymer Replacement Battery (QV43)

This is a 3.91V, 4150mAh (16.23Wh) Li-Polymer cell for the Motorola Moto Edge 50 Neo 5G, Moto S50 5G, ThinkPhone 25 5G, and XT2409-1. It replaces the OEM QV43 battery when the original cell degrades, swells, or no longer holds a charge. Same voltage, same connector, same BMS communication protocol as the factory cell.

• QV43 platform compatibility: The Moto Edge 50 Neo 5G, Moto S50 5G, and ThinkPhone 25 5G share the QV43 cell because they run the same power delivery architecture — same voltage rail, same flex connector layout, and the same fuel gauge IC handshake. Swapping across these models works without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Edge 50 Neo 5G platform. The BMS accepted the cell without fault flags, USB-PD negotiation completed normally, and the charge IC held the correct 4.45V full-charge cutoff throughout.
• Fuel gauge recalibration on first use: 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 one slow cycle lets the coulomb counter establish a new baseline before high-current fast charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement QV43 cell

This happens because the fuel gauge IC still references the discharge curve of the old, degraded cell. The new cell has a steeper voltage cliff at lower state-of-charge, so when the modem fires a high-current burst — during a call or 5G handoff — the voltage drops sharply and the IC reads it as a critical low. The phone cuts out even though capacity remains. One full slow discharge-charge cycle recalibrates the coulomb counter. After that cycle, shutdowns at 20–30% stop.

USB-PD fast charge not negotiating on first cycle after swap

On first connection after installation, the Edge 50 Neo 5G may fall back to standard 5W charging rather than accepting the faster USB-PD or TurboPower protocol. The charge IC treats a new, high-impedance cell cautiously on the first cycle and limits current until it confirms cell stability. This is normal BMS behaviour — not a fault with the replacement cell. Complete one full charge at the lower rate, then disconnect and reconnect the charger. Fast charging resumes from the second cycle onward.