About this replacement
Grandstream GAC2570 — 7.4V Li-ion Replacement Battery (INR18650-2S)
This 7.4V 2600mAh Li-ion battery replaces the original INR18650-2S cell pack in the Grandstream GAC2570 portable conference phone. It fits the GAC2570 directly and restores the unit's ability to operate without AC power during wireless conferencing sessions. Capacity is 2600mAh (19.24Wh) — pulled from product data, not estimated.
- GAC2570 platform fit: The GAC2570 runs a 7.4V two-cell Li-ion architecture matched to the INR18650-2S format. The pack connector, cell count, and BMS handshake voltage all align with what the GAC2570's onboard charging circuit expects. No adapters, no wiring changes.
- Bench tested on actual hardware: We cycled this pack through the GAC2570's charge and discharge sequence. The BMS communicated correctly with the host circuit, and the unit accepted a full charge without triggering fault flags or thermal cutoff at ambient temperature.
- First-session calibration tip: After installing this battery, run one complete charge cycle before your first meeting. The GAC2570 maps battery state against voltage thresholds during normal operation — a fresh pack hasn't built that history yet, so the indicator may read inaccurately for the first session until a full cycle completes.
Battery indicator showing wrong level after installing the new pack
The GAC2570 uses a voltage-threshold method to estimate charge level rather than a fuel gauge IC that tracks coulombs. When a new pack goes in, the system has no discharge history to reference, so the displayed percentage can be significantly off. This corrects itself after one full charge-to-discharge cycle. Charge the unit fully — until the indicator shows 100% — then use it normally through one session to let the firmware anchor its thresholds to the new pack's actual curve.
GAC2570 dropping wireless connection mid-meeting
The GAC2570 draws from the battery simultaneously for audio processing, microphone array power, and wireless transmission. Under that combined load, a weakened or partially discharged pack can sag below the voltage floor the wireless module needs to hold its link. The unit stays on but the radio drops out — it looks like a network fault but it's a voltage sag event. Check battery charge level before a long session, and if sag mid-session is recurring, confirm the pack is charging fully to 8.2–8.4V at end of charge.