Logitech Touchpad T650 Compatible Battery 3.7V 500mAh

Logitech Touchpad T650 / MX Master — 3.7V Li-Polymer Replacement Battery (533-000088)

This 3.7V, 500mAh Li-Polymer cell replaces the internal battery in the Logitech Touchpad T650 and MX Master wireless input devices. It matches OEM part numbers 533-000088 and HB303450. When the original cell fails, gesture tracking and wireless connectivity drop out entirely.

• T650 and MX Master compatibility: Both devices share the same battery bay dimensions, voltage rail, and connector footprint. The 51.55 × 34.80 × 3.60mm cell slots into either unit without modification to the housing or cable routing.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a T650 unit. The BMS accepted the cell without triggering a protection cutoff, and the device recognised a full charge state on first connect to the charging cable.
• Internal battery swap caution: The T650 uses a soldered or clip-seated ribbon connector — not a standard tab. Disconnect the old cell from the PCB before cutting any adhesive. Pulling the cell first risks tearing the connector pad off the board.

Why the T650 stops tracking after a partial charge cycle

Li-Polymer cells in low-draw devices like the T650 degrade through shallow cycling — repeated short charges that never complete a full charge-discharge cycle. Over time, the usable voltage window narrows. The touchpad's wireless module cuts out before the BMS trips because the radio needs a stable 3.5V minimum to maintain Bluetooth connection. A cell that reads 3.6V at rest may sag below that threshold under the brief transmit load. Replace the cell and run one full charge before pairing the device again.

Touchpad connects but drops gestures mid-use

This usually means the cell voltage is holding at rest but sagging during multi-finger gesture bursts, which spike the wireless transmitter draw. The BMS doesn't cut off, but the radio stutters. Users report it as a software or driver issue — it's nearly always a low-cell symptom. Check the battery indicator in Logitech Options software first. If it reads below 20%, the new cell should resolve the drop-outs after a full charge to 4.2V.