JBL Flip 6 Replacement Battery 3.7V 6800mAh Li-ion GSP-1S2P-F6D

JBL Flip 6 — 3.7V Li-ion Replacement Battery (GSP-1S2P-F6D)

This is a 3.7V Li-ion cell rated at 6800mAh (25.16Wh), direct fit for the JBL Flip 6 portable Bluetooth speaker. It covers models JBLFLIP6BLUAM and JBLFLIP6REDAM. Swap it in when the original cell no longer holds charge or the speaker shuts down before the indicator reaches empty.

• Flip 6 platform fit: The Flip 6 uses a single-cell 3.7V pack with the GSP-1S2P-F6D part number. The connector pinout and BMS handshake match the original, so the speaker's charge circuitry reads the new cell correctly without recalibration.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Flip 6 unit, monitoring BMS response to the combined amplifier and Bluetooth radio draw. The protection circuit held steady across loud audio bursts without triggering a false low-voltage cutoff.
• Fuel gauge reset after install: Once the new battery is fitted, run the speaker down fully until it powers off on its own, then charge it uninterrupted to 100%. This recalibrates the onboard fuel gauge — skipping this step causes the charge indicator to misread from day one.

Why the Flip 6 shuts down mid-track before the battery indicator hits empty

The Flip 6 amplifier pulls a sharp current spike when bass-heavy audio hits at high volume. If the cell has degraded internal resistance, that spike causes a voltage sag the BMS reads as undervoltage — and it cuts power before the fuel gauge catches up. The indicator can still show two bars when the speaker goes dark. A fresh cell with lower internal resistance handles those transient loads without tripping the protection circuit.

USB-C charging not starting on a deeply discharged Flip 6

If a Flip 6 sits unused for several months, the cell can drop below the USB-C Power Delivery minimum acceptance voltage — typically under 2.5V — and the charger won't initiate a session at all. The speaker shows no LED response and feels completely dead. Connect it to a 5V USB-A source first rather than a USB-C PD charger; lower-voltage trickle input often wakes the BMS enough to begin a recovery charge. Once the cell climbs above 3.0V, a standard USB-C charge cycle will complete normally.