{"product_id":"entel-ht640-replacement-battery-74v-2000mah-li-ion","title":"Entel HT640 Replacement Battery 7.4V 2000mAh CNB750E","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eEntel HT640 \/ HT642 \/ HT644 \/ HT649 Series — 7.4V Li-ion Replacement Battery (CNB750E)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2000mAh lithium-ion replacement battery for the Entel HT640, HT642, HT644, and HT649 handheld two-way radios. It uses OEM part number CNB750E and fits the same battery bay with the same contact layout. Voltage and capacity match the original Entel specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHT640 series compatibility:\u003c\/strong\u003e\n    The HT640, HT642, HT644, and HT649 share the same 7.4V battery bay, contact strip geometry, and BMS handshake protocol — one pack covers the full platform without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge, discharge, and PTT transmit-surge cycles on the HT640 platform. The BMS handled the transmit current spike without tripping and accepted dock charging from rest voltage without fault LED.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the dock:\u003c\/strong\u003e\n    If the dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Entel dock requires a clean contact cycle to complete the BMS handshake before charging 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 HT640 cuts out mid-transmission on a new CNB750E pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new lithium-ion cell ships at storage voltage — typically 3.6–3.7V per cell, putting the pack around 7.2–7.4V open-circuit. That reads fine at idle, but the HT640's transmit circuit draws a sharp current spike the moment PTT is pressed. If the BMS interprets that spike as an overcurrent event before the cells have been through a full charge cycle, it cuts power momentarily and the radio drops. The fix is to charge the pack fully before the first transmission shift, not straight from the box.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a new pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe HT640 uses a voltage-threshold bar indicator — no fuel gauge chip, just voltage steps mapped to bar segments. A new CNB750E at storage voltage sits at a threshold boundary, so the radio may display one bar fewer than a fully charged pack. This is not a capacity fault. Charge the pack to completion — the charger dock green LED confirms full charge — and the bar indicator will reflect the correct voltage level on next power-on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426205204570,"sku":"BWCS-NDT783TW-1","price":92.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426205237338,"sku":"BWCS-NDT783TW-2","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426205270106,"sku":"BWCS-NDT783TW-3","price":122.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NDT783TW-1.webp?v=1779930457","url":"https:\/\/batteryweb.com\/products\/entel-ht640-replacement-battery-74v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}