About this replacement
Grandstream GAC2570 — 7.4V Li-ion Replacement Battery (INR18650-2S)
This 7.4V, 3350mAh Li-ion battery replaces the original INR18650-2S pack in the Grandstream GAC2570 portable IP conference phone. It restores wireless conferencing capability when the factory battery no longer holds charge. Fits the GAC2570 only — verify your model before ordering.
- GAC2570 platform fit: The GAC2570 runs a dual-cell 18650 configuration in a 2S series arrangement to hit the 7.4V nominal rail. This pack matches that cell layout, the BMS handshake the unit expects, and the connector orientation. Swapping an incorrect voltage pack will trigger an immediate protection cutoff.
- Bench tested on actual hardware: We cycled this pack through the GAC2570's charge and discharge sequence. The BMS accepted the cells without fault flags, balanced correctly across both cells, and the unit exited charging cleanly at full voltage.
- First-session calibration on the GAC2570: Run a complete charge cycle before the first meeting. The GAC2570 maps battery state against voltage thresholds during normal operation. A new pack that hasn't completed one full cycle will show inaccurate charge indicators for the first session — this clears after a single full charge.
GAC2570 cutting out under combined audio and wireless draw
The GAC2570 pulls simultaneous current for the speaker array, microphone processing, and Wi-Fi or DECT radio during an active conference call. A degraded or deeply discharged new pack can sag below the BMS low-voltage threshold under that combined load, triggering a protective shutdown mid-call. This is not a faulty unit — it's the BMS doing its job. Charge the pack fully before the first session and the voltage floor stays high enough to handle peak draw without cutoff.
Battery percentage frozen or jumping after installation
A replacement pack shipped in storage state sits at a different resting voltage than the gauge's last calibration point. The GAC2570's indicator reads a static voltage map, so it reports whatever charge level matches that resting voltage — which may be wildly off. Charge the unit to 100% without interruption, then let it discharge through one full conference session. After that single cycle the reported percentage will track actual capacity correctly.