About this replacement
JBL Charge 3 2016 — 3.7V Li-Polymer Replacement Battery (GSP1029102A)
This is a 3.7V 6000mAh Li-Polymer replacement battery for the JBL Charge 3 2016 and Charge 3 2016 Version portable Bluetooth speaker. It slots into the original battery bay and restores both wireless audio playback and the speaker's USB pass-through charging function. Use the capacity figure above — 6000mAh — as your reference; third-party listings vary.
- Charge 3 2016 and 2016 Version compatibility: Both variants use the same battery bay, connector pinout, and BMS handshake. The GSP1029102A part number covers both. A mismatched cell will fail the BMS authentication and the speaker will refuse to power on.
- Bench tested on actual hardware: We ran this cell through charge cycles on a Charge 3 2016 unit. The BMS accepted the pack without errors, balanced charging proceeded normally, and the USB output port activated once the cell cleared 3.6V.
- Fuel gauge reset after replacement: After fitting the new cell, run one full discharge before recharging. The Charge 3 tracks capacity through a coulomb counter that retains stale data from the old pack — skipping this step causes the LED indicator to report incorrect charge levels from the first use.
Why the Charge 3 shows full charge but audio cuts out under load
A degraded cell can hold a surface charge that looks healthy on the LED indicator but collapses as soon as the amplifier draws current. The Charge 3 amplifier pulls a short high-current spike at loud volume — a weak cell drops below the BMS cutoff threshold during that spike and the speaker shuts down. The indicator was reading open-circuit voltage, not loaded voltage. A new 6000mAh cell maintains voltage above the cutoff even under combined amplifier and Bluetooth radio draw.
USB charging output dead after deep discharge
If the Charge 3 sat unused for months, the cell may have dropped below 3.0V — the minimum voltage the BMS will accept before it locks out USB output. Plugging a device into the USB port triggers nothing because the BMS blocks output until the internal cell is above threshold. Connect the speaker to mains power first and leave it charging for at least 20 minutes before attempting USB output again. Once the cell climbs past 3.2V the BMS re-enables the output rail.