{"product_id":"huntec-ht-3688-replacement-battery-74v-1200mah-li-ion","title":"HUNTEC HT-3688 Replacement Battery 7.4V 1200mAh LB-38L","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHUNTEC HT-3688 \/ HT-558 — 7.4V Li-ion Replacement Battery (LB-38L)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 1200mAh Li-ion replacement battery for the HUNTEC HT-3688 and HT-558 portable two-way radios. It uses OEM part number LB-38L and drops into the same battery bay without modification. Capacity is 1200mAh (8.88Wh), matching the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHT-3688 and HT-558 platform:\u003c\/strong\u003e\n    Both radios run the same 7.4V voltage rail and share an identical battery bay geometry, connector pinout, and BMS handshake protocol — which is why they take the same LB-38L pack. Swapping between models is not supported; confirm your model before ordering.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on the HT-3688 bench rig and monitored the BMS during PTT transmit spikes. The protection circuit held steady through repeated high-draw bursts without tripping into overcurrent lockout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion on the charger 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 HT-3688 charger requires a clean contact cycle to complete the BMS handshake before it will 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 HT-3688 cuts out mid-transmission on a freshly inserted battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen a new Li-ion pack ships, it sits at storage voltage — typically around 3.7V per cell, putting the pack near 7.4V at rest. The moment you key up, the transmit current spike can pull cell voltage below the BMS undervoltage threshold momentarily, tripping a brief cutout. This is not a faulty battery. Charge the pack fully to 8.4V before first operational use and the BMS will hold stable through normal PTT cycles.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after a full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe HT-3688 reads battery level using simple voltage-threshold steps — not a fuel gauge chip. A new cell's resting voltage can settle slightly below the threshold for the top bar within minutes of coming off charge, making the indicator drop one bar even though capacity is full. This is a voltage-settling effect, not a capacity issue. Key the radio up briefly to draw a light load, then re-check — the indicator will stabilise at the correct bar level once the surface charge dissipates.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426308948058,"sku":"BWCS-PUX328TW-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426308980826,"sku":"BWCS-PUX328TW-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426309013594,"sku":"BWCS-PUX328TW-3","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PUX328TW-1.webp?v=1779930681","url":"https:\/\/batteryweb.com\/products\/huntec-ht-3688-replacement-battery-74v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}