{"product_id":"hyt-tc-700-replacement-battery-74v-3350mah-li-ion","title":"HYT TC-700 BL1703 Replacement Battery 7.4V 3350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHYT TC-700 \/ TC-780 Series — 7.4V Li-ion Replacement Battery (BL1703)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 3350mAh lithium-ion battery replaces the OEM pack on the HYT TC-700, TC-700U, TC-780, and TC-780M portable two-way radios. It matches the original BL1703, BL1703Li, BL2102, BH1801, and BL-2102Li part numbers. Physical dimensions are 110.00 × 56.30 × 23.50mm — same footprint as the factory pack.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTC-700 and TC-780 platform fit:\u003c\/strong\u003e\n    Both radio lines share the same battery bay geometry, contact layout, and 7.4V supply rail. The BMS handshake protocol is identical across the TC-700U and TC-780M variants, so one pack covers the full family 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 full charge and discharge cycles on a TC-780M dock. The BMS responded correctly to transmit current spikes, held the protection threshold without nuisance tripping, and accepted a full charge on the first dock cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst dock insertion on the TC-700 charger:\u003c\/strong\u003e\n    If the charger LED shows a fault on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The TC-700 charger requires a clean contact cycle to complete the BMS handshake before it begins 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 TC-700 cuts out mid-transmission on a new BL1703 pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell ships at storage voltage — typically around 3.7V per cell, or roughly 7.4V total. When PTT is pressed, the transmit current surge can pull the pack below the BMS overcurrent threshold before a full charge cycle has conditioned the cells. The BMS interprets the spike as a fault and disconnects the output, which kills the transmission. A single full charge cycle before field use stabilises the cell impedance and prevents this trip.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a freshly charged pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TC-700 and TC-780 use a voltage-threshold bar indicator — each bar corresponds to a fixed voltage band, not a percentage from a fuel gauge chip. A new pack coming off its first charge may rest at a slightly lower open-circuit voltage than a broken-in cell, pushing the reading one threshold below full. This is not a capacity fault. After two to three full charge and discharge cycles, the resting voltage stabilises and the indicator aligns correctly with the 7.4V full-charge threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426230337626,"sku":"BWCS-HTC78TC-1","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426230370394,"sku":"BWCS-HTC78TC-2","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426230403162,"sku":"BWCS-HTC78TC-3","price":85.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTC78TC-1.webp?v=1779930493","url":"https:\/\/batteryweb.com\/products\/hyt-tc-700-replacement-battery-74v-3350mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}