Asus ROG Spatha Replacement Battery 3.7V 800mAh XHP102242

Asus ROG Spatha / LE55 — 3.7V Li-Polymer Replacement Battery (XHP102242)

This 3.7V, 800mAh Li-Polymer battery replaces the internal rechargeable cell in the Asus ROG Spatha and LE55 wireless gaming mouse. It restores wireless operation when the original cell no longer holds a charge. Dimensions are 44.20 × 21.00 × 10.50mm — confirm these against your existing cell before ordering.

• ROG Spatha and LE55 fit: Both models use the same charging dock and share this battery's connector type, voltage rail, and physical footprint. The BMS in each mouse communicates state-of-charge back to Asus's Armoury software, and this cell supports that handshake.
• Bench tested on actual hardware: We cycled this cell through the Spatha's dock charging circuit and confirmed the BMS accepted the cell, balanced charge correctly to 4.2V, and reported accurate charge state without triggering a fault flag.
• Post-swap dock seating: The Spatha charges through a magnetic dock, not a USB port on the mouse body. After fitting the new cell, seat the mouse firmly in the dock and verify the charging LED activates — a loose connection here means the cell never tops up between sessions.

Why the ROG Spatha drops its wireless connection after a battery replacement

The Spatha uses a 2.4GHz USB receiver paired to the mouse's internal memory. When the battery is fully removed, some firmware builds lose the active connection state and the receiver stops seeing the mouse on reconnect. This is not a fault with the new cell. Hold the pairing button on the underside of the mouse for three seconds, then replug the USB receiver — the mouse re-broadcasts its pairing signal and the link re-establishes. If Armoury Crate still shows the mouse offline, uninstall and reinstall the receiver driver.

Mouse pointer stuttering or jumping after fitting a new cell

Stuttering or erratic cursor movement immediately after a battery swap usually points to a voltage initialisation issue, not a defective cell. The Spatha's onboard controller expects the cell to settle above 3.5V before it ramps the optical sensor to full polling. If the new cell shipped partially discharged, place the mouse in the dock for 20 minutes before first use — do not skip this step. Once the cell reads above 3.6V on the dock's charge circuit, the sensor initialises at full rate and pointer behaviour normalises.