{"product_id":"tetra-cassidian-th1n-replacement-battery-37v-3150mah-li-polymer","title":"BLN-10 TETRA Cassidian TH1N Compatible Battery 3.7V 3150mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTETRA Cassidian TH1N — 3.7V Li-Polymer Replacement Battery (BLN-10)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 3150mAh lithium-polymer battery for the Cassidian TH1N portable professional radio. It also cross-references OEM part numbers BLN-11 and HT9980AA. Fit the TH1N directly — no tools, no modification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCassidian TH1N platform fit:\u003c\/strong\u003e\n    The TH1N runs a single-cell 3.7V Li-Polymer pack with a multi-pin connector that carries both power and BMS data to the radio's charging circuit. All three OEM part numbers — BLN-10, BLN-11, HT9980AA — share this same connector pinout and voltage rail, which is why they are interchangeable on this platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through a full charge-discharge cycle and confirmed the BMS trips correctly on overcurrent and recovers cleanly on recharge. Transmit current spikes on PTT did not trigger false lockout during our test session.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst dock insertion on the TH1N charger:\u003c\/strong\u003e\n    If the charger shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The TH1N dock needs 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 TH1N drops to reduced TX power mid-shift on a fresh battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe TH1N monitors pack voltage in real time and steps down transmit power when voltage sags below its internal threshold — even on a new cell at partial charge. A new Li-Polymer pack ships at storage voltage, typically around 3.6–3.7V open circuit. Under sustained RF output, that storage charge delivers less headroom than a fully topped cell, so the radio interprets the sag as a low-battery condition and reduces TX power to protect the circuit. Charge the pack fully before the first shift and this behaviour stops.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator reads one bar fewer than expected after fitting the BLN-10\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TH1N uses a voltage-threshold bar indicator — it reads cell voltage and maps it to bars, nothing more. A new pack at storage voltage sits in the lower voltage band, so the display shows one fewer bar even though the cell is healthy and at near-full capacity. This is not a fault in the battery or the radio. Charge the pack completely in the TH1N dock until the charger LED goes solid green, then reinsert — the bar indicator will reflect the correct charge state at or above 4.1V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426210087002,"sku":"BWCS-ETH110TW-1","price":71.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426210119770,"sku":"BWCS-ETH110TW-2","price":85.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426210152538,"sku":"BWCS-ETH110TW-3","price":94.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ETH110TW_1.webp?v=1779930436","url":"https:\/\/batteryweb.com\/products\/tetra-cassidian-th1n-replacement-battery-37v-3150mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}