{"product_id":"hyt-pt580-replacement-battery-74v-2000mah-li-ion","title":"HYT PT580 Replacement Battery BL1806 7.4V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHYT PT580 \/ PT580H — 7.4V Li-ion Replacement Battery (BL1806)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2000mAh Li-ion replacement for the HYT BL1806 battery pack. It fits the PT580 and PT580H handheld transceivers used in commercial and industrial field operations. Voltage and capacity match the OEM spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePT580 and PT580H compatibility:\u003c\/strong\u003e\n    Both models run the same 7.4V rail and use the same physical connector and BMS handshake protocol. One pack covers either variant — no hardware differences affect fit or function.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through simulated PTT bursts on the PT580 platform. The BMS handled transmit current spikes without tripping, and the charger dock accepted the handshake on first insertion across all units tested.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion on 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 PT580 charging dock requires a clean contact surface to complete the BMS handshake — a fingerprint or dust layer on the contacts is enough to block acceptance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the PT580 drops to reduced TX power mid-shift on a new BL1806\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-ion cell ships at storage voltage — typically around 3.7V per cell, not full charge. Under sustained RF output, that reduced state of charge causes voltage sag that the radio interprets as a low-battery condition. The PT580 firmware responds by stepping down transmit power to protect the final-stage amplifier. A full charge cycle before deployment eliminates this — the pack needs to reach 8.4V (4.2V per cell) before heavy field use.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator reads one fewer bar than expected after fitting the BL1806\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe PT580 uses a voltage-threshold bar indicator, not a fuel gauge chip. At storage voltage, the resting pack voltage sits below the threshold for a full-bar reading, so the display shows one or two bars even on a brand-new cell. This is not a capacity fault. Charge the pack fully — confirmed when the dock LED goes solid green — then reseat it and the bar indicator will read correctly at 8.4V resting.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426325528666,"sku":"BWCS-HTC806TW-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426325561434,"sku":"BWCS-HTC806TW-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426325594202,"sku":"BWCS-HTC806TW-3","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTC806TW-1.webp?v=1779930634","url":"https:\/\/batteryweb.com\/products\/hyt-pt580-replacement-battery-74v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}