{"product_id":"lighthawk-replacement-battery-74v-7800mah-li-ion","title":"LightHawk 9B-1963-2 Replacement Battery 7.4V 7800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLightHawk 9B-1963-2 \/ 9B-1963-3 — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 7800mAh (57.72Wh) lithium-ion replacement battery for LightHawk flashlights using OEM part numbers 9B-1963-2 or 9B-1963-3. Both part numbers share the same cell format, voltage rail, and connector footprint. Drop this in when the original cell can no longer hold charge or sustain full output.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e9B-1963-2 and 9B-1963-3 compatibility:\u003c\/strong\u003e\n    These two OEM part numbers cover the same battery platform — same 7.4V nominal voltage, same physical dimensions (66.80 × 60.00 × 37.85mm), and the same BMS handshake. LightHawk revised the part number between production runs without changing the electrical spec.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through full charge and discharge on the bench. The BMS held stable under high-current draw typical of turbo-mode flashlight drivers, and protection circuitry triggered correctly at low-voltage cutoff without false trips during normal use.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMulti-cell load balancing tip:\u003c\/strong\u003e\n    If your LightHawk light runs two cells, replace both simultaneously from the same batch. A new cell paired with a worn cell creates a mismatch — under high-current draw the weaker cell discharges first, then gets reverse-loaded by the stronger one, accelerating failure.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFlashlight driver stepping down output before the battery indicator reads low\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eHigh-output flashlight drivers monitor cell voltage in real time, not just state-of-charge percentage. When voltage sags under turbo-mode current draw, the driver steps down to a lower output mode before the indicator registers a low reading. This is brownout protection — the driver is preventing a deeper voltage collapse that could damage the cell. A new cell with full capacity holds voltage higher for longer, so step-downs happen later and less frequently.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNoticeably shorter runtime in turbo mode vs standard mode\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eTurbo mode pulls 5–10× more current than standard mode from the same cell. Higher current draw accelerates voltage sag, and the BMS reaches its low-voltage cutoff threshold faster. This is normal behaviour — it is not a fault with the battery. If turbo runtime feels unusually short, check resting cell voltage after a full charge; it should read at or above 8.2V on a 7.4V nominal Li-ion pack before any load is applied.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377512480858,"sku":"BWCS-KLS600FT-1","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377512513626,"sku":"BWCS-KLS600FT-2","price":69.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377512546394,"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\/lighthawk-replacement-battery-74v-7800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}