{"product_id":"nightstick-xpp-5582rx-replacement-battery-37v-10000mah-li-ion","title":"Nightstick XPP-5582RX Replacement Battery 3.7V 10000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNightstick XPP-5582RX \/ XPR-5582GX — 3.7V Li-ion Replacement Battery (5582-BATT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 10000mAh (37Wh) lithium-ion replacement for the Nightstick 5582-BATT. It fits the XPP-5582RX and XPR-5582GX rechargeable flashlights used by law enforcement and emergency responders. Capacity figure is taken from the product specification — not estimated from web sources.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXPP-5582RX and XPR-5582GX compatibility:\u003c\/strong\u003e\n    Both lights share the same battery bay dimensions, 3.7V nominal rail, and BMS handshake protocol — that's why a single pack covers both models. The connector pinout and cell geometry are identical across the pair.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the XPP-5582RX driver at full turbo output. The BMS held steady across high-current draw, with cutoff triggering at the correct low-voltage threshold rather than stepping down prematurely.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFull-charge storage before extended standby:\u003c\/strong\u003e\n    Li-ion cells in standby flashlights self-discharge slowly over weeks. Store this pack at roughly 50–60% charge if the light won't be used for more than a month — a fully charged cell sitting idle for extended periods accelerates electrolyte degradation faster than partial-state storage.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the XPP-5582RX dims before the battery indicator drops\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe XPP-5582RX driver monitors cell voltage directly, not the fuel-gauge percentage shown on the indicator. When voltage sags under the high current draw of turbo mode, the driver steps output down to protect the cell — even if the indicator still reads partial charge. This is a deliberate brownout protection response, not a fault. Switching to a lower output mode at this point restores stable brightness because current draw drops and voltage sag stops. If the light dims immediately after a fresh charge, check that the battery contacts are clean and seated fully.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTurbo mode cuts out far sooner than standard mode — what's happening\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eTurbo mode on the XPP-5582RX draws substantially more current than standard or low modes — the cell voltage sags under that load faster than it does at moderate output. The driver interprets this sag as a low-voltage event and steps the output down or cuts out entirely, even though the cell still holds significant capacity at lower draw rates. This is normal behaviour for a single high-capacity li-ion cell driving a high-output LED at its maximum rating. If turbo runtime is significantly shorter than expected after a full charge, verify the charge cycle completed fully and the battery reached 4.2V before use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377506058330,"sku":"BWCS-NXP558FT-1","price":55.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377506091098,"sku":"BWCS-NXP558FT-2","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377506123866,"sku":"BWCS-NXP558FT-3","price":72.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NXP558FT-1.webp?v=1778767205","url":"https:\/\/batteryweb.com\/products\/nightstick-xpp-5582rx-replacement-battery-37v-10000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}