Xpend Smart Remote WQAGA43 Compatible Battery 3.7V 1400mAh

Xpend Smart Remote WQAGA43 — 3.7V Li-ion Replacement Battery (TM503443 2S1P)

This is a 3.7V, 1400mAh Li-ion replacement battery for the Xpend Smart Remote WQAGA43. It fits directly into the original battery cavity and restores full remote function. Use this when the original cell has depleted and the remote stops responding or becomes unreliable.

• WQAGA43 compatibility: The 2S1P cell configuration and flat 5.00mm profile match the Xpend WQAGA43 remote's internal battery bay. The connector and cell dimensions are specific to this remote — a generic flat-pack Li-ion will not seat or connect correctly.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held voltage stable across the full discharge curve and triggered low-voltage cutoff cleanly without dropping below the IR LED's minimum drive threshold prematurely.
• Two-cell remote installation tip: The WQAGA43 uses a 2S1P pack — both cells ship as a single unit. Do not attempt to replace only one cell inside the pack. Install the full replacement assembly to avoid cell imbalance that shortens overall pack life.

IR output dropping before the battery reads empty on the remote

Li-ion cells in remotes lose usable capacity gradually, but IR LEDs need a minimum voltage to fire at full power. On the WQAGA43, the LED drive circuit starts under-powering the IR burst before the battery hits its cutoff voltage. That means the remote appears to still have charge but the signal no longer reaches the receiver reliably. If range drops to under a metre before any low-battery indicator appears, the cell is below the LED's minimum threshold — replace it now rather than waiting for a full cutoff.

Remote completely unresponsive after fitting the new battery

The most common cause is connector seating — the flat-pack connector on the TM503443 2S1P must click fully into the socket. A partial connection passes no current. If seating is confirmed, check whether a stuck or jammed button is holding the circuit active and draining the cell immediately after install. Press each button and confirm it springs back cleanly. If still no response, measure voltage at the connector terminals — a healthy charged cell reads 3.7V to 4.2V.