About this replacement
JBL PartyBox 110 — 7.4V Li-ion Replacement Battery (IBA064GA)
This is a 7.4V 5200mAh (38.48Wh) Li-ion replacement battery for the JBL PartyBox 110 portable Bluetooth speaker. It fits directly in place of the original IBA064GA and ICA002GA cells. Replace it when the speaker no longer holds a charge or loses power mid-session.
- PartyBox 110 fit: The PartyBox 110 runs a 7.4V dual-cell Li-ion pack with a dedicated BMS that monitors cell balance and controls charge cutoff. This replacement matches that voltage rail and connector, so the onboard protection circuitry communicates correctly with the pack.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the PartyBox 110 platform. The BMS accepted the cells without fault flags, cell balance stayed within spec across multiple cycles, and the speaker's charge indicator tracked accurately through each stage.
- Fuel gauge calibration on the PartyBox 110: Constant top-off charging — plugging in before the battery drops below 50% — causes the fuel gauge to drift over time. Run the PartyBox 110 down below 20% at least once a month before recharging to keep the charge indicator accurate and slow capacity fade on the Li-ion cells.
Why the PartyBox 110 shows full charge but audio cuts at high volume
At high volume, the PartyBox 110's amplifier pulls a sharp current spike that the battery must supply on top of the Bluetooth radio draw. An aged or degraded cell cannot deliver that combined current without its voltage sagging below the amplifier's operating threshold. The BMS interprets this sag as a low-voltage event and can trigger a protective cutoff, even though the resting charge indicator showed a full pack. A fresh cell with lower internal resistance handles the surge without the same voltage drop.
Audio distorting before the battery indicator reaches empty
This symptom appears when a degraded cell's actual capacity no longer matches what the fuel gauge reports. As the cell discharges, voltage sags early under amplifier load — the amp clips because supply voltage is too low, producing audible distortion before the indicator reads low. The charge indicator is reading estimated state-of-charge, not live voltage under load. After fitting a replacement pack, run one full discharge cycle so the BMS can recalibrate its state-of-charge estimate against the new cell's actual curve.