Facom 779.CL16 Replacement Battery 7.2V 2700mAh

Facom 779.CL16 / 779.CL1 — 7.2V Ni-MH Replacement Battery (31059063)

This is a 7.2V 2700mAh Ni-MH replacement battery for the Facom 779.CL16 and 779.CL1 work lights. It matches OEM part number 31059063 and slots directly into the battery compartment of both torch models. The 19.44Wh capacity keeps the LED driver fed through extended sessions in automotive bays and confined workspaces.

• 779.CL16 and 779.CL1 compatibility: Both torches share the same 7.2V six-cell Ni-MH pack format, physical dimensions, and connector orientation — one battery covers both models without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the 779.CL16 driver board. The BMS accepted full charge termination cleanly and the driver held regulated output through the discharge curve without premature dimming steps.
• Multi-cell replacement discipline: Never mix this new pack with any surviving original cells inside the torch. The 779.CL16 runs six cells in series — one weaker cell will drag down the entire string under high-current draw and will reverse-charge at end of discharge, shortening its life rapidly.

Why the 779.CL16 steps down brightness before the battery indicator triggers

The LED driver in the 779.CL16 uses brownout protection that responds to terminal voltage, not the battery indicator circuit. When cell voltage sags under high-current draw, the driver steps output down before the indicator registers low. This is deliberate — the driver protects the LED array from an undervoltage condition that would cause flickering. A fresh, fully charged 2700mAh pack holds terminal voltage higher for longer, pushing that step-down point later in the discharge cycle.

Torch cycling through modes or flickering at the end of a charge

Mode-cycling near end of charge is a driver brownout loop — voltage drops below the driver's regulation threshold, the driver cuts, voltage recovers slightly, the driver restarts, and the cycle repeats. This is not a torch fault. It means the pack is at or below the minimum operating voltage for the driver, typically around 5.4V on a 7.2V Ni-MH string. Switching to the lowest output mode at this point allows the driver to regulate within its range and extend usable output. Replace the pack when this cycling starts occurring well before the torch feels dim.