JBL BassPro Go 10.8V Replacement Battery HFR-SC42300C09H210

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

This is a 10.8V, 2000mAh Ni-MH replacement battery for the JBL BassPro Go portable speaker. It replaces OEM part HFR-SC42300C09H210 and restores audio playback and bass output to units with depleted or failing original packs. Dimensions are 134.00 × 68.00 × 25.50mm — confirm against your existing cell before installing.

• BassPro Go compatibility: The BassPro Go runs its amplifier and subwoofer driver from a single 10.8V Ni-MH cell pack. The BMS expects that specific voltage rail and connector pinout — swapping to an incompatible voltage causes the unit to refuse to power on entirely.
• Bench tested on actual hardware: We cycled this pack through repeated charge and discharge sequences on the BassPro Go. The BMS accepted the cell without fault flags, held the amplifier rail steady under bass-heavy test tracks, and showed no thermal shutdown events during extended playback sessions.
• Ni-MH discharge habit for the BassPro Go: Unlike Li-ion cells, this Ni-MH pack benefits from periodic full discharges. Run the speaker until it shuts itself off — roughly once a month — before recharging. Constant top-off charging without a full cycle causes voltage depression on Ni-MH cells, which shrinks usable capacity faster than normal ageing.

Why the BassPro Go distorts audio before the battery indicator reads empty

The BassPro Go's amplifier draws a large current spike every time bass frequencies hit — far more than mid or treble content. As the Ni-MH pack ages, internal resistance rises and voltage sags sharply under those peaks. The amplifier clips against that sagging rail, which sounds like distortion or crackling, even though the onboard fuel gauge still shows charge remaining. Replacing the pack resolves the sag — if distortion returns quickly on a new cell, check that the charging port is delivering the rated input voltage.

Speaker showing full charge but audio cuts out after an extended session

This is a fuel gauge drift issue, not a charging problem. When the BassPro Go is topped off repeatedly before the pack drops below 30%, the onboard gauge loses calibration and reports a higher state of charge than the cell actually holds. The speaker cuts out mid-session because the real capacity is far lower than displayed. Run the unit to full shutdown on the new pack, then charge uninterrupted to 100% — that single full cycle re-anchors the gauge to accurate endpoints.