EAC63558705 LG XBOOM Go PL5 Replacement Battery 3.8V 3700mAh

LG XBOOM Go PL5 / PL5W — 3.8V Li-Polymer Replacement Battery (EAC63558705)

This 3.8V 3700mAh Li-Polymer cell replaces the original EAC63558705 battery in the LG XBOOM Go PL5 and PL5W portable Bluetooth speakers. It restores wireless audio playback when the original pack no longer holds a charge or fails to accept a charge cycle. Capacity is rated at 14.06Wh — matching the OEM specification.

• PL5 and PL5W compatibility: Both models share the same 3.8V battery rail, connector pinout, and BMS handshake protocol. The cell slots into the same physical cavity with identical solder pad spacing, so no modification is needed between the two variants.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the PL5 platform. The BMS accepted the cell without error flags, completed a full charge cycle, and held voltage across sustained Bluetooth audio output at moderate and high amplifier draw.
• Fuel gauge recalibration after install: After fitting a new cell, run the speaker down to the low-battery warning before recharging — once, on the first cycle. The PL5 fuel gauge calibrates against a known discharge floor. Skip this step and the indicator can read 30% when the cell is nearly flat.

Capacity fade on the PL5 from constant top-off charging

The PL5 is frequently used as a desktop speaker and plugged in whenever it's not actively playing. Li-Polymer cells held at or near full charge long-term experience elevated electrolyte stress, which accelerates capacity fade. The cell never completes a meaningful discharge-recharge cycle, so the BMS fuel gauge also drifts — the indicator shows full while actual capacity is already reduced. To slow this process, discharge the speaker below 20% at least once a month before reconnecting the charger.

Audio distorting before the battery indicator reaches empty

This symptom points to voltage sag under amplifier load, not a dead cell. As the battery depletes, internal resistance rises — at high volume, the amplifier draws a current spike the cell can no longer deliver cleanly, and output voltage drops below the threshold the amp needs. The speaker's protection circuit hasn't triggered yet, so the indicator still shows charge remaining. If this starts happening earlier than expected on a new battery, check that USB-C charging completed fully — an incomplete charge cycle leaves resting voltage short of 4.35V, compressing usable headroom from the first use.