JBL Flip 4 Replacement Battery 3.7V 3000mAh Li-Polymer GSP872693

JBL Flip 4 / Flip 4 Special Edition — 3.7V Li-Polymer Replacement Battery (GSP872693 01)

This is a 3.7V, 3000mAh Li-Polymer replacement battery for the JBL Flip 4 and Flip 4 Special Edition portable Bluetooth speakers. It replaces OEM part numbers GSP872693 01, GSP872693 03A, and P763098 03A. Swap it in when the original pack no longer holds enough charge to get through a normal listening session.

• Flip 4 and Flip 4 Special Edition fit: Both models share the same battery bay dimensions, connector pinout, and BMS communication protocol — one cell covers both. The Special Edition carries no electrical difference from the standard unit at the battery level.
• Bench tested on actual hardware: We ran charge and discharge cycles through the Flip 4's onboard BMS. The protection circuit triggered correctly at the low-cell cutoff, and the fuel gauge re-calibrated to the 3000mAh capacity across repeated cycles without false full-charge flags.
• Fuel gauge reset after install: After fitting a new cell, run the speaker down until it auto-shuts off, then charge uninterrupted to 100% in one go. Skipping this step leaves the fuel gauge calibrated to the old, degraded cell and causes the battery indicator to read inaccurately from day one.

Capacity fade from constant top-off charging on the Flip 4

The Flip 4 is frequently left on charge at a desk or beside a bed — topped up before it drops below 50%. Li-Polymer cells degrade faster when held near full charge for extended periods because the cathode stays under sustained high-voltage stress. Shallow cycling without a periodic full discharge also causes the onboard fuel gauge to drift, so the speaker reports more charge than it actually holds. Let the cell drop below 20% at least once a month before starting a full charge cycle.

Audio distorting before the battery indicator reaches empty

If you hear clipping or crackling while the battery still shows one or two bars, the cell is sagging under the combined load of the amplifier and the Bluetooth radio — even though the indicator hasn't caught up. A worn cell's internal resistance rises, so voltage drops sharply the moment the amplifier demands peak current for louder passages. The indicator lags because it reads resting voltage, not loaded voltage. A new cell with lower internal resistance holds the voltage rail steady under that combined draw, eliminating the distortion before the low-battery warning triggers.