Libratone Zipp Replacement Battery 14.8V 2600mAh Li-ion

Libratone Zipp — 14.8V Li-ion Replacement Battery (INR18650-4S1P-GYH)

This is a 14.8V, 2600mAh Li-ion replacement battery pack for the Libratone Zipp portable wireless speaker. It uses four 18650 cells wired in series to match the original 4S1P configuration. Fit model is INR18650-4S1P-GYH — confirm this against your speaker's original pack before ordering.

• Libratone Zipp platform fit: The Zipp series runs its amplifier board and wireless radio off a single 14.8V rail. A 4S1P pack is the only configuration that meets that rail voltage without a boost converter — swapping in a different cell count or series arrangement will prevent the speaker from powering on at all.
• Bench tested on actual hardware: We cycled this pack through the Zipp's charge circuit and verified the BMS balanced all four cells within 20mV at full charge. The pack held voltage through simulated high-volume audio draws without triggering the low-voltage cutoff prematurely.
• Monthly discharge cycle for Zipp users: The Zipp is frequently left on a desk and topped off before it drops below 50%. Do that consistently and the fuel gauge drifts — the speaker reports full charge but cuts out early. Let the pack discharge below 20% at least once a month before recharging to recalibrate the gauge.

Audio distortion before the battery indicator reaches empty on the Zipp

As the pack voltage drops toward the lower end of the discharge curve, the amplifier board receives less headroom than it needs to reproduce peaks cleanly. The result is audible clipping or crackling well before the Zipp's indicator shows a low-battery warning. This happens because the indicator is calibrated to the pack's average resting voltage, not its loaded voltage under amplifier draw. If distortion starts appearing with two or three bars showing, check cell voltage under load — each cell should read above 3.5V during playback.

Bluetooth dropping specifically at high volume on the Zipp

At high volume the amplifier pulls a hard current spike, and the wireless radio draws simultaneously on the same 14.8V rail. If the pack has any capacity fade, this combined load causes a brief voltage sag that forces the BMS into a protective low-voltage pause. The radio loses its connection during that pause, which reads to the user as a Bluetooth dropout. The fix is not a settings change — replace the pack if it no longer sustains voltage above 13.2V under combined load.