BLU Bluetooth Remote WL200AP Compatible Battery 3.7V 850mAh

BLU Bluetooth Remote — 3.7V Li-ion Replacement Battery (21221-10296051)

This 3.7V, 850mAh Li-ion battery replaces the original cell in the BLU Bluetooth Remote (SGI-WL200AP / WL200AP). It fits the RCU unit used with BLU entertainment devices. Voltage and capacity match the original spec exactly.

• SGI-WL200AP and WL200AP compatibility: Both remote variants share the same 3.7V cell footprint, OEM part number, and connector orientation. One replacement covers the full WL200AP line without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the WL200AP platform. The BMS accepted the cell cleanly, reached full charge voltage without fault, and IR output held consistent across the test run.
• Single-cell remote install tip: This remote runs one Li-ion cell — not an alkaline pair. Verify the connector clicks fully into the socket before closing the housing. A half-seated connector causes intermittent drop-outs that look like a dead battery.

IR output drop on the WL200AP after a few weeks of use

Li-ion cells in low-draw remotes can sit partially discharged for weeks between heavy use. That idle self-discharge pulls cell voltage below the IR LED's minimum drive threshold before the remote gives any low-battery warning. The result is a remote that fires commands only at close range or stops responding entirely. A full recharge to 4.2V restores normal IR range immediately.

Remote completely unresponsive right after fitting the new battery

The most common cause is connector orientation — the JST-style plug on this cell can be inserted backwards with moderate force and no obvious resistance. A reversed connection delivers no voltage to the board, so nothing powers on. Disconnect, flip the connector 180°, reseat it until it clicks, and the remote will power on without any reset procedure.