Motorola Moto G Stylus 5G QS50 Replacement Battery 3.8V 4400mAh

Motorola Moto G Stylus 5G XT2419 (2024) — 3.8V Li-Polymer Replacement Battery (QS50)

This is a 3.8V, 4400mAh Li-Polymer replacement battery for the Motorola Moto G Stylus 5G (XT2419, 2024). It carries OEM part number QS50 and fits the specific connector and BMS handshake used on the XT2419 board. Replace it when the original cell no longer holds a charge or won't accept one at all.

• XT2419 (2024) fitment: The 2024 Moto G Stylus 5G uses a dedicated QS50 cell with a three-pad flex connector and a BMS that communicates charge state to the Snapdragon fuel gauge IC. A cell from an earlier Stylus generation uses a different connector pitch and will not seat correctly on this board.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the XT2419 board and confirmed the BMS accepted the charge handshake without fault codes. Voltage held stable under simultaneous 5G modem and display load — no premature cutoff observed.
• Fuel gauge recalibration on first use: After installing this cell, disable fast charging and run one complete discharge-to-charge cycle before re-enabling it. The fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve on that first cycle — skipping this step causes the percentage readout to drift by up to 15 points.

Sudden shutdown at 20–30% after a cell swap on the XT2419

The Snapdragon power management IC on the XT2419 maps voltage thresholds it learned from the old cell. A fresh QS50 cell has a slightly different voltage-to-capacity curve, so the phone's shutdown trigger fires earlier than the displayed percentage suggests. Under peak load — 5G radio scan plus screen on — the new cell's voltage dips briefly below the IC's cutoff floor even though the gauge still shows charge remaining. One full discharge-charge cycle with fast charging disabled lets the coulomb counter relearn the curve and typically pushes the shutdown point back below 5%.

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

On the first charge after installation, the XT2419's charge IC runs a trickle phase while it verifies BMS communication with the new cell. During this phase, the phone may show the standard charging icon rather than the fast-charge indicator, and charge current stays low. This is not a fault — the IC elevates current automatically once it completes the verification pass, usually within the first 10–15 minutes. If fast charging still doesn't activate after a full cycle, check that the USB-C cable supports high-current transfer and reboot the device before trying again.