{"product_id":"hyt-tc-700-replacement-battery-74v-1600mah-li-ion","title":"HYT BL1703 TC-700 Replacement Battery 7.4V 1600mAh","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 is a 7.4V, 1600mAh Li-ion battery for the HYT TC-700, TC-700U, TC-780, and TC-780M two-way radios. It also cross-references OEM part numbers BL1703Li, BL2102, BH1801, and BL2102Li. If your current pack no longer holds charge through a full shift, this is the direct swap.\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 series run the same 7.4V power rail, share an identical battery bay connector, and use the same BMS handshake protocol — which is why a single pack covers the full lineup without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on a TC-700 body, confirmed the BMS handshake completed correctly with the HYT charger dock, and verified that the transmit-current spike on PTT did not trip overcurrent cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the HYT dock:\u003c\/strong\u003e\n    If the dock LED flashes fault on first seating, remove the pack and wipe the gold contact strip with a dry cloth before reseating. The HYT charger checks contact resistance as part of its BMS handshake cycle, and even light surface oxidation from storage can cause a rejection on the first attempt.\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 freshly installed battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TC-700 draws significantly more current during transmit than during standby or receive. A new pack shipped at storage voltage — typically around 3.7V per cell — has higher internal resistance than a fully charged cell. When PTT is pressed, that resistance causes a brief voltage sag. If the sag drops below the BMS undervoltage threshold, the pack cuts out before the transmission completes. The fix is straightforward: charge the pack fully before the first use on-radio, which brings cell voltage to 4.2V per cell and lowers resistance enough to handle the transmit surge cleanly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected after installing this pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TC-700 and TC-780 use a voltage-threshold bar indicator — not a fuel gauge chip. Each bar corresponds to a voltage band, and a new cell at storage voltage (roughly 3.7–3.8V per cell) sits in the two-bar zone even though the pack is not depleted. This is normal cell behaviour, not a capacity fault. Charge the pack fully in the HYT dock until the green LED confirms completion, then insert it into the radio — the indicator will read correctly at full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426349056090,"sku":"BWCS-HTC700TW-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426349088858,"sku":"BWCS-HTC700TW-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426349121626,"sku":"BWCS-HTC700TW-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTC700TW-1.webp?v=1779930720","url":"https:\/\/batteryweb.com\/products\/hyt-tc-700-replacement-battery-74v-1600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}