Honeywell Pro 7 Alarm System Replacement Battery 3.7V 10000mAh

Honeywell Pro 7 / AIO7 Series — 3.7V Li-ion Replacement Battery (300-10186)

This is a 3.7V, 10000mAh Li-ion replacement battery for the Honeywell Pro 7 security control panel. It fits the Pro 7, AI05-2, AIO7-1, and AIO7-2 alarm system units. The battery provides backup power to keep the panel active and monitoring during mains outages.

• Pro 7 and AIO7 platform fit: These models share the same 3.7V single-cell architecture, connector pinout, and BMS communication protocol — which is why one battery covers all four variants. Swapping between mains and backup supply is managed by the panel's internal charge controller, not the battery itself.
• Bench tested on actual hardware: We ran this cell through charge acceptance and float-charge verification on the Pro 7 panel. The BMS accepted the cell without fault codes, and the panel reached float voltage within the expected 24–48 hour window under normal mains supply.
• Post-installation charge window: Do not run a zone or siren diagnostic immediately after fitting this battery. The panel's charge controller needs 24–48 hours on mains power to bring the new cell to full float charge. Running a test before that window closes can trigger a false low-battery report from the panel.

Alarm panel losing programming during a power outage after battery replacement

If the panel drops its zone programming or reverts to defaults during a mains outage, the new battery has not yet been fully accepted by the charge controller. At partial charge, the cell cannot sustain the panel's memory retention voltage under load. The fix is straightforward — restore mains power and leave the panel on charge for a full 48 hours before the next outage or test. Once the cell reaches float charge, programming will hold through a mains failure as expected.

Panel reports low battery hours after a new cell is installed

This is a charge-state reporting issue, not a fault with the replacement cell. The Pro 7 panel reads battery status against a voltage threshold — a freshly installed cell sits below that threshold until it has been on float charge long enough. The panel will continue to flag low battery until the cell climbs above approximately 3.9V under the panel's charge current. Leave the panel on uninterrupted mains power for 24–48 hours and the low-battery alert will clear on its own.