{"product_id":"nightstick-9500-replacement-battery-37v-6800mah-li-ion","title":"Nightstick 9500 Replacement Battery 3.7V 6800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNightstick NSR-9500 Series — 3.7V Li-ion Replacement Battery (9600-BATT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 6800mAh Li-ion cell built to replace the OEM 9600-BATT in Nightstick's 9500, 9600, and 9900 series tactical flashlights. These lights are used in law enforcement and search-and-rescue, where a degraded cell means a light that steps down at the worst moment. Capacity figure is sourced from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e9500 \/ 9600 \/ 9900 platform fit:\u003c\/strong\u003e\n    These models share the same tube diameter, cell format (139.40 × 24.00 × 24.00mm), and driver voltage rail. The BMS handshake and charge termination logic are matched to this cell spec across all three variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a 9500-series host. The BMS stepped down output correctly at low-voltage threshold and accepted a full charge cycle without fault flags or thermal cutoff events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSingle-cell replacement protocol:\u003c\/strong\u003e\n    The 9500 series runs one cell. If you're replacing it because runtime dropped sharply, check the charge contacts in the tube for corrosion before fitting the new cell — a resistive contact forces higher current draw at the cell level and accelerates the next cell's wear.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Nightstick 9500 steps down output before the indicator shows low\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 9500's driver uses brownout protection to step down output when cell voltage drops under sustained high-current draw — typically in turbo or high mode. This can happen well before the charge indicator triggers, because the indicator reads resting voltage, not loaded voltage. Under a heavy draw, the cell's internal resistance causes a larger voltage sag than the indicator accounts for. If you see the light step down unexpectedly, switching to a lower output mode lets the cell voltage recover and extends usable output.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTurbo mode cutting out far sooner than standard mode\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eTurbo mode on the 9500 series pulls significantly more current than standard or medium modes — often five to ten times the draw. A 6800mAh cell has fixed energy capacity; higher current draw depletes it faster and also increases voltage sag under load. When the sag crosses the driver's cutoff threshold, the light steps down or shuts off even though the cell still holds charge at rest. To reset the driver after a turbo cutoff, switch the light off, wait 10–15 seconds for cell voltage to recover, then restart on a lower mode.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377496326234,"sku":"BWCS-NXP961FT-1","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377496359002,"sku":"BWCS-NXP961FT-2","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377496391770,"sku":"BWCS-NXP961FT-3","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NXP961FT-1.webp?v=1778767222","url":"https:\/\/batteryweb.com\/products\/nightstick-9500-replacement-battery-37v-6800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}