{"product_id":"tetra-cassidian-th1n-replacement-battery-37v-1550mah-li-polymer","title":"BLN-10 TETRA Cassidian TH1N Compatible Battery 3.7V 1550mAh","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 3.7V, 1550mAh Li-Polymer battery replaces the BLN-10, BLN-11, and HT9980AA packs in the Cassidian TH1N portable TETRA radio. The TH1N is a professional land mobile radio used in emergency services and enterprise comms. Slim at 6.70mm thick, the pack slots into the standard battery bay without modification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTH1N platform fit:\u003c\/strong\u003e\n    The BLN-10, BLN-11, and HT9980AA are all 3.7V Li-Polymer packs built to the same physical and electrical spec for the TH1N. They share the same connector pinout and BMS handshake protocol, so all three OEM part numbers draw from the same replacement.\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 transmit loads on the TH1N platform. The BMS handled PTT-triggered current spikes without tripping into protection mode, and the cell voltage held stable across sustained RF output.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the TH1N dock:\u003c\/strong\u003e\n    If the charger dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The TH1N dock 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\"\u003eTH1N bar indicator showing fewer bars than expected on a new BLN-10 pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNew Li-Polymer cells ship at storage voltage — typically around 3.6V to 3.7V, not a full 4.2V charge. The TH1N reads pack voltage through fixed threshold steps and converts that to bar segments. A pack at storage voltage will show one or two bars even though the cell is healthy. Charge the pack fully in the dock before judging capacity. Once the cell reaches 4.2V, the indicator will reflect the correct state.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTH1N drops to reduced TX power mid-shift on a charged pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSustained RF output draws significantly more current than standby, and Li-Polymer cells show voltage sag under that load. If the pack voltage dips below the radio's TX threshold during a long transmission, the TH1N steps down output power to protect the circuit — this is not a BMS fault. Check resting voltage after the shift ends: if it recovers above 3.7V within a few minutes, the cell is fine and the sag was load-induced. If resting voltage sits below 3.5V, the cell is at end of life and needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426211266650,"sku":"BWCS-ETH100TW-1","price":64.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426211299418,"sku":"BWCS-ETH100TW-2","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426211332186,"sku":"BWCS-ETH100TW-3","price":85.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ETH100TW-1.webp?v=1779930436","url":"https:\/\/batteryweb.com\/products\/tetra-cassidian-th1n-replacement-battery-37v-1550mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}