About this replacement
Motorola Moto Edge 2024 / Edge 50 Fusion 5G — 3.91V Li-Polymer Replacement Battery (QC50 / SB18E08902)
This 3.91V, 4850mAh (18.96Wh) Li-Polymer cell replaces the original QC50 battery in the Moto Edge 2024, Moto Edge 2024 5G, Moto Edge 50 Fusion 5G, and XT2405-1. It is a direct internal swap for phones showing swollen batteries, sudden shutdowns, or cells that no longer hold a charge. Voltage and capacity match the OEM spec exactly.
- Moto Edge 2024 and Edge 50 Fusion 5G compatibility: Both variants run the same 3.91V power rail, use the same QC50 cell footprint, and share the SB18E08902 vendor code. The BMS handshake and connector pinout are identical across this model family, so one cell covers all listed variants.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Moto Edge 2024 platform. The BMS accepted the cell without fault flags, fast-charge negotiation completed normally after one full cycle, and the fuel gauge IC tracked state-of-charge without erratic jumps.
- Fuel gauge recalibration after swap: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes power into an uncalibrated cell — preventing false percentage readings from the first day.
Sudden shutdown at 20–30% on the Moto Edge 2024 after a cell swap
This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The phone thinks it has charge remaining, but the new cell hits its voltage floor under modem or display load and collapses before the OS can trigger a soft shutdown. It is not a fault with the replacement cell — it is a calibration mismatch. Run one full discharge to 0% and a full charge to 100% without interruption to reset the coulomb counter, and the shutdowns will stop.
USB-PD fast charge not working on the first cycle after replacement
The Moto Edge 2024 charge IC runs a handshake with the battery BMS on the first cycle after a new cell is detected. Until that handshake completes, the phone defaults to standard 5V charging and fast charge appears inactive. This is normal behaviour — not a wiring fault or incompatible cell. Fully discharge the phone once, then connect to the original Motorola charger and let it charge to 100% uninterrupted. Fast charge will negotiate correctly from the second cycle onward.