{"product_id":"vertex-replacement-battery-74v-1800mah-li-ion","title":"Vertex FNB-Z182 7.4V 1800mAh Compatible Battery for Two-Way Radio","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVertex FNB-Z182 — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 1800mAh Li-ion battery that replaces the Vertex FNB-Z182 and FNB-Z182ZI packs used in compatible Vertex portable two-way radios. It ships at storage voltage — not full charge — which is normal for Li-ion transport. Capacity is 13.32Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFNB-Z182 and FNB-Z182ZI compatibility:\u003c\/strong\u003e\n    Both OEM part numbers share the same 7.4V cell configuration, connector pinout, and BMS handshake protocol — so this single replacement covers both variants without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through transmit-load draws to confirm the BMS holds above the undervoltage cutoff threshold during sustained PTT bursts. The cell balance stayed within spec across the test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the charger dock:\u003c\/strong\u003e\n    If the dock shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat it firmly. Vertex charger docks require a clean contact cycle to complete the BMS handshake before charging can begin.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy a new FNB-Z182 pack triggers the dock fault LED on first insertion\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion packs ship at roughly 3.6–3.7V per cell — below the voltage threshold Vertex charger docks expect to see before they begin a charge cycle. If the dock reads a voltage below its acceptance window, it flags a fault rather than starting the charge. This is not a defective battery. A full reseat after wiping the contacts usually clears it; if not, leaving the pack in the dock for 60 seconds allows the BMS to signal the charger and initiate trickle acceptance.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRadio cuts out completely when PTT is pressed — new battery installed\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eTransmitting draws a sharp current spike — often 1.5A or more — that a new, uncharged pack at storage voltage can trigger as an overcurrent event in the BMS. The BMS trips the circuit to protect the cells, and the radio drops off mid-transmission. Charge the pack to full before the first shift; at 8.4V (full charge for a 7.4V Li-ion), the BMS overcurrent threshold has enough headroom to handle normal PTT load without tripping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426302984282,"sku":"BWCS-MTD288TW-1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426303017050,"sku":"BWCS-MTD288TW-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426303049818,"sku":"BWCS-MTD288TW-3","price":57.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MTD288TW-1.webp?v=1779930602","url":"https:\/\/batteryweb.com\/products\/vertex-replacement-battery-74v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}