JBL Flip 2 Replacement Battery 3.7V 2200mAh Li-Polymer

JBL Flip 2 (2014) — 3.7V Li-Polymer Replacement Battery (JN151PH13849)

This 3.7V, 2200mAh lithium-polymer battery replaces the original pack in the JBL Flip 2 (2014) portable Bluetooth speaker. It fits both the Flip 2 and Flip II 2014 variants, which share identical battery dimensions and connector pinout. Use the capacity figure from the product listing — 2200mAh — as the reference for this cell.

• Flip 2 and Flip II (2014) fitment: Both model names refer to the same 2014 hardware revision. The battery bay, JST connector orientation, and BMS communication lines are identical across both, so one cell covers both variants without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Flip 2 mainboard. The onboard BMS accepted the pack without fault codes, and the charge controller stepped through its constant-current and constant-voltage phases normally to 4.2V cutoff.
• Monthly discharge cycle for the Flip 2: Let the speaker drain below 20% at least once a month before recharging. The Flip 2 is frequently left on a desk and topped off constantly — this shallow-cycle pattern causes fuel gauge drift over time, making the indicator read full while actual capacity has dropped.

Audio distorting before the battery indicator reaches empty on the Flip 2

The Flip 2 amplifier draws a sharp current spike at mid-to-high volume levels. When cell voltage sags under that load, the amplifier clips before the fuel gauge registers low battery. The indicator can still show two bars while audio is already distorting. This is a voltage sag symptom, not a capacity symptom — a fresh cell at full charge eliminates it because internal resistance is lower and the voltage rail holds steady under the amp draw.

Flip 2 not waking from USB charge after sitting unused for weeks

Lithium-polymer cells self-discharge during storage. If the Flip 2 sits unused long enough, the cell can drop below the minimum voltage the USB charge controller will accept — typically around 2.5V — and the unit appears completely dead. The fix is to apply a trickle charge using a bench supply or a charger with a recovery mode set to 3.0V before attempting a standard USB charge cycle. Once the cell recovers above the acceptance threshold, normal USB charging resumes.