{"product_id":"yaesu-hx280s-replacement-battery-74v-1800mah-li-ion","title":"Yaesu FNB-V105Li HX280S Replacement Battery 7.4V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYaesu HX280S \/ HX380 — 7.4V Li-ion Replacement Battery (FNB-V105Li)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 1800mAh Li-ion replacement battery for the Yaesu HX280S, HX280, HX280E, and HX380 handheld transceivers. It carries OEM part number FNB-V105Li and slots directly into the battery bay on all four models. Voltage and cell chemistry match the original Yaesu specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHX280S \/ HX380 platform fit:\u003c\/strong\u003e\n    All four models in this series share the same 7.4V rail, battery bay dimensions, and BMS handshake protocol. One pack works across the group because the connector pinout and communication lines are identical — no modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on the HX280S and monitored the BMS through transmit draw. The protection circuit responded correctly to PTT-triggered current spikes and held voltage within the expected operating window throughout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion on a charger dock:\u003c\/strong\u003e\n    If the dock shows a fault LED on first seat, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Yaesu charging platform requires a clean contact cycle to complete the BMS handshake before current flow begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the HX280S cuts out mid-transmission on a new FNB-V105Li\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-ion cell ships at storage voltage — typically around 3.7V per cell, giving roughly 7.4V at the pack terminals. During PTT, the HX280S draws a sharp transmit current spike. If the cell hasn't been through at least one full charge cycle, that spike can drag pack voltage below the BMS cutoff threshold momentarily, causing the radio to drop out. Run a full charge before the first transmission test. After one complete cycle, cell impedance settles and the BMS holds cleanly through sustained RF output.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after fitting FNB-V105Li\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe HX280S reads pack charge state through voltage thresholds, not a fuel gauge chip. A new pack at storage voltage sits at the boundary between bar levels, so the display shows one bar short of full. This is not a capacity fault. Charge the pack fully in the dock — once terminal voltage reaches approximately 8.4V at end of charge, the indicator will show the correct full-charge bar count.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426295906394,"sku":"BWCS-VRX280TW-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426295939162,"sku":"BWCS-VRX280TW-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426295971930,"sku":"BWCS-VRX280TW-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-VRX280TW-1.webp?v=1779930602","url":"https:\/\/batteryweb.com\/products\/yaesu-hx280s-replacement-battery-74v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}