JBL Xtreme GSP0931134 Replacement Battery 7.4V 5000mAh

JBL Xtreme — 7.4V Li-Polymer Replacement Battery (GSP0931134)

This 7.4V 5000mAh Li-Polymer battery replaces the GSP0931134 cell inside the JBL Xtreme and JBLXTREME Bluetooth speakers. It targets the original pack when it no longer holds a charge through a full listening session. Capacity matches the factory spec at 37Wh.

• Xtreme and JBLXTREME compatibility: Both model designations use the same GSP0931134 pack, the same 7.4V rail, and the same connector footprint. The BMS handshake is identical across both — no firmware difference separates them.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the Xtreme platform. The BMS accepted charge without error flags and regulated cutoff voltage correctly at both ends of the discharge curve.
• Fuel gauge recalibration after install: After fitting a new cell, run the speaker down to the low-battery warning before recharging the first time. The Xtreme's fuel gauge calibrates against a full discharge cycle — skipping this step causes the indicator to report inaccurate charge levels from the start.

Capacity fade on the Xtreme from constant top-off charging

The Xtreme is built for outdoor use, which means many owners keep it plugged in on a desk between sessions. Li-Polymer cells held at 100% charge under heat — including the warmth of the amplifier running continuously — accelerate electrolyte breakdown at the anode. The result is real capacity loss within months, not years. Letting the pack drop below 20% at least once a month before a full recharge slows this process. Storing the speaker at around 50–60% charge when it will sit unused for weeks also reduces long-term cell stress.

Audio distorting before the battery indicator reaches empty

The Xtreme's 40W amplifier pulls significant current at high volume. As the cell ages and internal resistance rises, voltage sags under that load even when the indicator still shows charge remaining. The amplifier hits its minimum supply voltage and clips the signal — heard as distortion or crackle — before the battery protection circuit shuts down. This is a cell condition symptom, not a speaker fault. Measuring the pack under load will show voltage dropping below 6.8V during a loud passage, confirming the cell can no longer sustain the current demand.