{"product_id":"yaesu-vx-820-replacement-battery-74v-2200mah-li-ion","title":"Yaesu VX-820 FNB-V86LI Replacement Battery 7.4V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYaesu VX-820 \/ VX-821 \/ VX-824 \/ VX-829 Series — 7.4V Li-ion Replacement Battery (FNB-V86LI)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2200mAh (16.28Wh) lithium-ion battery for the Yaesu VX-820, VX-821, VX-824, and VX-829 handheld transceivers. It replaces OEM part numbers FNB-V86LI and FNB-V87LI. The battery slots directly into the radio's battery bay and connects via the standard Vertex contact strip.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVX-820 series platform fit:\u003c\/strong\u003e\n    The VX-820, VX-821, VX-824, and VX-829 share the same battery bay dimensions, voltage rail, and contact pinout. A single pack covers all four models because the BMS handshake threshold and connector layout are identical across the series.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on a VX-820 through repeated PTT transmit bursts. The BMS held the voltage rail stable under the transmit current spike and recovered cleanly between transmissions without triggering overcurrent cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion contact cycle:\u003c\/strong\u003e\n    If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Vertex platform requires a clean contact cycle to recognise the new BMS and begin charging.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the VX-820 cuts out mid-transmission on a freshly inserted battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eReplacement packs ship at storage voltage — typically around 3.7V per cell, or roughly 7.4V combined. That's at the lower edge of the VX-820's acceptable input range. When PTT is pressed, transmit draw spikes sharply and the BMS may trip overcurrent protection before the cells have been conditioned through a full charge cycle. This isn't a defective pack — it's the BMS doing its job at a low state of charge. Charge the battery fully before first field use; the cutout behaviour stops once the cells are at operating voltage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a new FNB-V86LI\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe VX-820 uses a simple voltage-threshold bar indicator — each bar corresponds to a voltage band, not a percentage from a fuel gauge chip. A new pack at storage voltage reads lower than a fully charged cell, so the radio displays one fewer bar than it will after a full charge. This is normal behaviour for any new lithium-ion pack. Charge the battery completely in the dock and confirm the indicator reads full before drawing conclusions about pack capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426351349850,"sku":"BWCS-FNB86TW-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426351382618,"sku":"BWCS-FNB86TW-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426351415386,"sku":"BWCS-FNB86TW-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FNB86TW-1.webp?v=1779930807","url":"https:\/\/batteryweb.com\/products\/yaesu-vx-820-replacement-battery-74v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}