{"product_id":"koehler-lighthawk-600-replacement-battery-74v-7800mah-li-ion","title":"Koehler Lighthawk 600 Replacement Battery 7.4V 7800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKoehler Lighthawk 600 Series — 7.4V Li-ion Replacement Battery (9B-1963-2)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 7800mAh Li-ion battery for the Koehler Lighthawk 600, Lighthawk 600 Lumens, and Lighthawk Gen II LED flashlights. It replaces OEM part 9B-1963-2 directly. At 57.72Wh, it matches the original cell configuration and voltage rail these lights run on.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLighthawk 600 and Gen II LED compatibility:\u003c\/strong\u003e\n    These three models share the same 7.4V two-cell battery format, connector pinout, and BMS handshake protocol. Swapping between them without changing the battery platform was intentional in the Gen II refresh — same pack, updated driver board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through full charge and discharge on a Lighthawk 600 body. The BMS held cutoff at the correct low-voltage threshold and balanced both cells within 20mV at full charge. No false low-battery triggers during the cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMulti-cell replacement timing:\u003c\/strong\u003e\n    The Lighthawk 600 runs two cells in series. If you are mixing this new pack into a light that still has one aged original cell, stop — replace the full pack as a unit. A weaker cell drains first under the high-current draw of turbo mode and can be pushed below its safe floor by the stronger cell continuing to discharge through it.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Lighthawk 600 steps down output before the indicator reads low\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Lighthawk 600 driver monitors cell voltage in real time and steps down output — usually from turbo to high or medium — before the battery indicator registers low. This is brownout protection built into the driver, not a battery fault. It activates when cell voltage drops under load, even if resting voltage still reads acceptable. If the light steps down frequently and early in a session, the battery's internal resistance has likely climbed — the cells can no longer sustain voltage under the current draw turbo mode demands.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery reads full but turbo mode lasts noticeably less time than it used to\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eTurbo mode on the Lighthawk 600 draws significantly more current than standard or high modes — often five to ten times more. A degraded cell may hold a surface charge that reads as full at rest, but voltage collapses the moment high current flows. The driver reads this sag as a low-voltage condition and steps output down within seconds. Charge the replacement pack fully before its first turbo session and confirm resting voltage sits at or above 8.2V before use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377512644698,"sku":"BWCS-KLS600FT-1","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377512677466,"sku":"BWCS-KLS600FT-2","price":69.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377512710234,"sku":"BWCS-KLS600FT-3","price":76.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KLS600FT-1.webp?v=1778767206","url":"https:\/\/batteryweb.com\/products\/koehler-lighthawk-600-replacement-battery-74v-7800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}