{"product_id":"vertex-standard-vx-351-replacement-battery-74v-2600mah-li-ion","title":"Vertex Standard VX-351 Compatible Battery 7.4V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVertex Standard VX-351 \/ VX-354 \/ VX-359 — 7.4V Li-ion Replacement Battery (FNB-V130LI)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 2600mAh Li-ion pack replaces the FNB-V130LI in the Vertex Standard VX-351, VX-354, and VX-359 portable two-way radios. These radios are common across security, emergency services, and professional comms teams. Capacity is 2600mAh (19.24Wh) — use that figure for any duty-cycle planning, not third-party estimates.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVX-351 \/ VX-354 \/ VX-359 platform fit:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, contact pin layout, and BMS handshake protocol — one pack covers the range without any adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the Vertex Standard charger dock and confirmed the BMS handshake completes correctly — charge LED transitions from red to green without fault interruption, and the overcurrent circuit holds under simulated PTT transmit load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion on the VX-series dock:\u003c\/strong\u003e\n    If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The VX-series dock requires a clean contact cycle to accept the new BMS before charging begins — this is a contact issue, not a faulty cell.\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-351 cuts out mid-transmission on a new FNB-V130LI\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003ePTT transmit on the VX-351 draws a short current spike — typically 1.5–2A — as the RF stage fires up. A new pack shipped at storage voltage (around 3.7V per cell) has higher internal impedance than a fully charged cell. That impedance causes a momentary voltage sag, which can trip the BMS overcurrent threshold before the cell reaches operating charge. Charge the pack fully before first use — the dock needs to see the cell above 7.0V total to hold the charge cycle open.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after fitting the FNB-V130LI\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe VX-series bar indicator reads voltage thresholds directly — it does not track charge state through a counting chip. A new cell at storage voltage sits below the top threshold, so the radio displays one bar fewer than full even with a brand-new pack installed. This is not a capacity fault. Run a full charge cycle through the Vertex Standard dock and let the cell reach 8.4V before drawing conclusions — the indicator will step up to the correct bar level once voltage is there.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426332606554,"sku":"BWCS-FNB35TW-1","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426332639322,"sku":"BWCS-FNB35TW-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426332672090,"sku":"BWCS-FNB35TW-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FNB35TW-1.webp?v=1779930720","url":"https:\/\/batteryweb.com\/products\/vertex-standard-vx-351-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}