ILCO 79 Lock Replacement Battery 2.4V 2700mAh Ni-MH

ILCO 79 Lock — 2.4V Ni-MH Replacement Battery (132-512886)

This is a 2.4V, 2700mAh Ni-MH rechargeable battery pack for the ILCO 79 electronic door lock. It replaces part number 132-512886, restoring power to the lock's keyless entry and motorised latch mechanisms. Fit model is the ILCO 79 Lock series only — confirm your part number before ordering.

• ILCO 79 Lock series fit: The 79 Lock platform uses a dedicated 2.4V Ni-MH pack rather than standard AA cells. That voltage rail matches the lock's control board and motor driver directly. A mismatched voltage causes the BMS to reject the pack or trip the undervoltage cutoff at startup.
• Bench tested on actual hardware: We cycled this pack through the ILCO 79 lock's full power-on sequence and confirmed the BMS handshake completed without fault codes. The motor-start current draw at latch engagement stayed within spec across multiple cycles.
• Post-install access method check: After fitting this pack, test every access method — keypad, key card, and any app-based entry — before closing the door. The ILCO 79 requires a firmware handshake to complete after power is restored, and the lock may not accept all access methods until that sequence finishes.

Why the ILCO 79 Lock motor stalls or grinds after a battery replacement

Ni-MH packs leave the factory in a partial state of charge — typically 30–50% capacity. The ILCO 79's latch motor draws a sharp current spike at the moment of engagement, and a partially charged pack can sag below the BMS cutoff threshold during that spike. The lock then faults out mid-cycle, which sounds like a stall or grind. Run a full charge before the first use to bring the pack to its rated 2.4V so the motor-start surge doesn't trip the cutoff.

Low battery warning showing immediately after fitting a new 132-512886 pack

This happens when the lock's control board reads open-circuit voltage instead of load voltage at startup — a Ni-MH pack that hasn't been charged will measure below the lock's low-battery threshold even though the pack itself is fine. It's not a faulty battery; it's a capacity issue at first install. Charge the pack fully before fitting it, and the warning clears. If the warning persists after a full charge cycle, check that the pack is seated correctly and the contacts are making clean contact — resting voltage on a fully charged 2.4V Ni-MH pack should read approximately 2.5–2.6V at the terminals.