JBL Charge 3.7V 6000mAh Li-Polymer Replacement Battery

JBL Charge — 3.7V Li-Polymer Replacement Battery (AEC982999-2P)

This 3.7V, 6000mAh Li-Polymer battery replaces the original cell in the JBL Charge portable Bluetooth speaker. It fits the first-generation Charge unit that uses OEM part AEC982999-2P. Swap it when the original pack no longer holds enough charge to sustain audio playback away from an outlet.

• JBL Charge first-generation fit: The Charge uses a single large-format Li-Polymer cell at 3.7V nominal. This pack matches the original cell's footprint at 96.00 × 29.30 × 19.46mm and presents the correct voltage profile for the onboard charging circuit and fuel gauge IC to read accurately.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the Charge speaker. The BMS accepted charge without fault flags, the fuel gauge tracked state of charge correctly, and audio output held steady across the full discharge curve without amplifier clipping events.
• Monthly full-discharge cycle — JBL Charge specific: The Charge is frequently kept on a desk and topped off constantly. Discharge the speaker below 20% at least once a month before recharging. Constant shallow topping without a full cycle causes fuel gauge drift on this hardware — the indicator reads full while actual capacity has already degraded.

Audio distorting before the battery indicator reaches empty

As a Li-Polymer cell ages, its internal resistance climbs. The JBL Charge amplifier draws a significant current spike during loud passages. With a worn cell, that spike causes a voltage sag that drops below the amplifier's clean operating threshold before the fuel gauge reads empty. The result is audible clipping and distortion at medium-to-high volume while the LED still shows remaining charge. A fresh cell with lower internal resistance eliminates the sag — the amplifier gets stable voltage through the full discharge cycle.

JBL Charge won't wake from USB after sitting unused for weeks

Li-Polymer cells self-discharge at roughly 2–3% per month in storage. A Charge left unused for several months can drop below the USB-C PD minimum acceptance voltage, and the charging circuit will not initiate a normal charge cycle. The fix is to apply a controlled pre-charge at a low rate — some USB chargers do this automatically, but if the speaker shows no response after 30 minutes on USB, move to a charger rated at 5V/2A and leave it connected for a full hour. If the cell has not dropped below approximately 2.5V per cell, it will recover and the circuit will resume normal charging from there.