{"product_id":"streamlight-vulcan-180-replacement-battery-37v-10400mah-li-ion","title":"Streamlight Vulcan 180 Replacement Battery 3.7V 10400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eStreamlight Vulcan 180 — 3.7V Li-ion Replacement Battery (44351)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 10,400mAh Li-ion battery replaces the original cell pack in the Streamlight Vulcan 180 flashlight. The Vulcan 180 is a high-output torch used by fire, search and rescue, and industrial crews who depend on sustained full-power output. When the original cell degrades, the driver steps down brightness before the indicator registers low — swapping this cell restores full output from the start of each charge cycle.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVulcan 180 cell format:\u003c\/strong\u003e\n    The Vulcan 180 uses a single integrated Li-ion pack at 3.7V. The driver circuit communicates with the BMS to manage high-current draw across turbo and standard modes — voltage, connector, and BMS handshake all need to match the OEM spec to avoid false low-battery shutdowns.\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 high-draw discharge on the Vulcan 180 driver. The BMS held stable across mode transitions and did not trip on turbo-mode current spikes. Capacity came in consistent with the rated 10,400mAh across multiple discharge runs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eTurbo-mode discharge management:\u003c\/strong\u003e\n    Turbo mode on the Vulcan 180 pulls significantly more current than standard mode. Avoid leaving the light in turbo when the battery is already below 50% — the driver will step down output aggressively at that voltage point, and repeated deep draws from a low state of charge shortens cell life faster than normal cycling.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Vulcan 180 dims before the low-battery indicator fires\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Vulcan 180 driver monitors cell voltage in real time, not charge percentage. When the cell sags under high current draw — particularly in turbo mode — the driver hits its brownout threshold and steps the output down before the indicator LED registers low. This is not a fault; it is the driver protecting the cell from over-discharge. As the original cell ages and internal resistance rises, this voltage sag happens earlier in the discharge curve. A fresh cell with low internal resistance holds voltage steady under load and delays that step-down significantly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVulcan 180 not reaching full brightness after a full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the light charges completely but still starts dim, the cell is likely holding a surface charge rather than a true full charge — common with aged or deeply discharged Li-ion cells. The BMS may have locked out charging at a deep-discharge floor, leaving the cell at a lower actual voltage than the indicator suggests. Check cell voltage directly at the pack terminals: a healthy fully charged cell should read between 4.1V and 4.2V. If it reads below 3.9V after a full charge cycle, the cell has degraded past recovery and needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377514512474,"sku":"BWCS-SLX180FT-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377514545242,"sku":"BWCS-SLX180FT-2","price":44.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377514578010,"sku":"BWCS-SLX180FT-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SLX180FT-1.webp?v=1778767222","url":"https:\/\/batteryweb.com\/products\/streamlight-vulcan-180-replacement-battery-37v-10400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}