Koehler Lighthawk LED 7.4V Replacement Battery 9B-1962-1

Koehler Lighthawk LED / Lighthawk Vision LED — 7.4V Li-ion Replacement Battery (9B-1962-1)

This is a 7.4V, 7800mAh (57.72Wh) lithium-ion battery for the Koehler Lighthawk LED and Lighthawk Vision LED flashlights. It replaces OEM part number 9B-1962-1. Compatible models include the 07712, 07732, and 14 additional Lighthawk variants sharing the same voltage rail and cell format.

• Lighthawk LED platform fit: The Lighthawk LED and Vision LED share the same 7.4V two-cell pack format, connector pinout, and BMS handshake protocol. That consistency across the 07712, 07732, and extended model range is why one cell format covers the full lineup.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the Lighthawk LED driver. The BMS held cell balancing across both cells throughout, and the protection circuit tripped correctly at the low-voltage cutoff threshold — no false shutoffs during normal draw.
• Multi-cell replacement discipline: This pack houses two cells. If you are swapping one pack in a dual-battery Lighthawk configuration, replace both packs at the same time from the same production batch. Pairing a new pack with a partially degraded one lets the weaker pack drain first, which forces it into repeated deep discharge under high-current turbo draw — that accelerates cell failure in the older pack.

Lighthawk LED dimming before the battery indicator shows low

The Lighthawk's LED driver uses brownout protection to step output down before the battery voltage actually hits the low-battery threshold shown on any indicator. When cell voltage drops under sustained turbo draw, the driver reduces current to the LED to protect itself — the light dims even though the indicator has not triggered. This is normal driver behaviour, not a battery defect. If you see it, switch to a lower output mode. The driver will hold stable output for longer at reduced current draw.

Turbo mode runtime significantly shorter than standard mode — what is happening

Turbo mode on the Lighthawk LED draws five to ten times the current of standard mode. At that draw rate, the 7800mAh capacity depletes proportionally faster, and cell voltage sags under load — which can also trigger the driver's brownout step-down earlier. This is not a faulty battery; it is the physics of high-current draw on any lithium-ion cell. To extend time between charges, use turbo in short bursts and drop to a lower mode for sustained illumination. Check cell voltage after a long turbo session — a healthy pack should recover above 7.0V within a few minutes of rest.