JBL BassPro Go Replacement Battery 10.8V 3000mAh Ni-MH

JBL BassPro Go — 10.8V Ni-MH Replacement Battery (HFR-SC42300C09H210)

This is a 10.8V 3000mAh Ni-MH replacement battery for the JBL BassPro Go portable Bluetooth speaker. It fits the BassPro Go directly and restores full wireless audio operation when the original cell has degraded. Capacity is 3000mAh (32.4Wh), matching the factory specification.

• BassPro Go battery platform: The BassPro Go uses a single Ni-MH pack at 10.8V to power both the amplifier stage and the Bluetooth radio simultaneously. Any drop in cell capacity hits both loads at once, which is why audio and wireless performance degrade together as the original pack ages.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the BassPro Go chassis. The BMS accepted the cell without error flags, held stable voltage under combined amplifier and radio draw, and showed no thermal event across the full discharge curve.
• Ni-MH cycling tip for the BassPro Go: Ni-MH cells in portable speakers are prone to voltage depression if they are repeatedly charged from a high state. Run the BassPro Go down past 20% at least once a month before recharging to prevent fuel gauge drift and keep cell capacity from compressing over time.

Why the BassPro Go reads full charge but audio drops after extended play

Ni-MH cells that have been shallow-cycled for months develop a reduced usable voltage window — the pack appears full on the indicator but actual deliverable energy is well below rated capacity. The BassPro Go's amplifier pulls additional current during bass-heavy playback, which accelerates voltage sag on a degraded cell. When the cell voltage drops below the amplifier's minimum rail, the speaker cuts audio to protect the circuit even though the gauge still shows charge remaining. Replacing the pack and running a full discharge-to-recharge cycle resets the usable capacity baseline.

Audio distorting before the battery indicator reaches empty

This happens when the cell voltage sags under high amplifier current demand before the pack is technically empty. The amplifier clips its output signal rather than shut down cleanly, producing audible distortion at moderate to high volume levels. The root cause is a cell that can no longer maintain the voltage needed at peak draw — a fresh Ni-MH pack at 10.8V nominal holds the rail steady enough to prevent clipping. After fitting the replacement, verify the pack charges fully to 10.8V before the first full playback session.