About this replacement
LG XBOOM Go PL7 / XBOOM 360 — 7.4V Li-Polymer Replacement Battery (EAC66836137-2S)
This 7.4V 3500mAh Li-Polymer battery replaces the original pack in the LG XBOOM Go PL7, PL7.ABRALLK, XBOOM 360, and XBOOM DXG7 portable Bluetooth speakers. It matches the OEM voltage, capacity, and connector spec at 25.9Wh. Swap it in when the original no longer holds a charge or the speaker dies well before the indicator reaches empty.
- PL7, XBOOM 360, and DXG7 compatibility: These models share the same 7.4V two-cell Li-Polymer architecture, identical connector pinout, and the same BMS handshake protocol — so one pack covers the full group without modification.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on the PL7 platform. The BMS accepted the cell without error flags, voltage regulation across the audio amplifier stayed within spec, and the fuel gauge reported correctly throughout.
- Monthly discharge cycle for desk-top users: If the speaker sits plugged in or gets topped off before dropping below 50%, run it down past 20% at least once a month before recharging. Constant shallow charging causes fuel gauge drift on this cell chemistry and accelerates capacity loss faster than regular cycling does.
Why the PL7 reads full charge but audio cuts out after an hour
A degraded Li-Polymer cell can still report a high state of charge to the fuel gauge while its actual deliverable capacity has dropped significantly. The BMS reads resting voltage — not cycle-counted capacity — so the indicator stays green until the cell sags hard under amplifier load. Once the combined draw of the Bluetooth radio and Class D amplifier pulls the cell below the BMS low-voltage threshold, the speaker cuts out even though the display never reached empty. Replacing the pack resets the available capacity and aligns the fuel gauge to real-world output again.
Audio distorting before the battery indicator reaches empty
At high volume, the amplifier draws sharp current spikes that cause the cell voltage to sag momentarily below the clean-power threshold. When the battery is partially depleted, internal resistance rises and those sag events deepen — the amplifier clips because it can't get enough sustained voltage, not because the volume setting changed. The speaker's protection circuit may also interpret the sag as a low-battery condition and throttle output before the gauge shows critical. If distortion starts at medium-to-high volume with 30–40% charge showing, check resting cell voltage with a multimeter — a healthy cell at that charge level should hold above 7.0V at rest.