{"product_id":"airbus-thr9-replacement-battery-37v-5200mah-li-ion","title":"Airbus THR9 Replacement Battery 3.7V 5200mAh Li-ion BLN-5i","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAirbus THR9 Series — 3.7V Li-ion Replacement Battery (BLN-5i \/ BLN-6)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 5200mAh Li-ion replacement battery for the Airbus THR9 family of professional portable transceivers. It fits the THR9, THR9i, THR9 C-30, and THR9 Ex. The BLN-5i and BLN-6 part numbers are interchangeable across this platform.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTHR9 platform compatibility:\u003c\/strong\u003e\n    The THR9, THR9i, C-30, and Ex variants share the same battery bay geometry, contact layout, and BMS handshake protocol. All four accept the BLN-5i and BLN-6 packs 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 cycles and PTT transmit loads on a THR9 dock. The BMS handled transmit current spikes without tripping and accepted the charger handshake on first insertion.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eContact strip check on first dock insertion:\u003c\/strong\u003e\n    If the THR9 charger shows a fault LED on the first seat, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The platform requires a clean contact cycle to complete the BMS handshake before charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTHR9 transmit current spike and BMS overcurrent cutoff\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen PTT is pressed on the THR9, transmit current draws spike sharply — far above idle draw. A new pack at storage voltage sits near 3.6V, which is lower than a fully charged cell. At that voltage, the BMS has less headroom before it reads the spike as an overcurrent event and cuts the output. Charging to full before the first operational shift eliminates this risk. A fully charged BLN-5i holds approximately 4.2V at rest.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTHR9 bar indicator showing one fewer bar than expected on a new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNew Li-ion cells ship at storage voltage — typically 3.6V — not at full charge. The THR9 reads voltage at set thresholds and maps that to a bar count, so a pack at storage voltage displays one bar low from the moment it is inserted. This is not a capacity fault or a cell defect. Run one full charge cycle through the dock until the charger LED goes green, and the bar count will reflect the actual 5200mAh capacity correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426298396762,"sku":"BWCS-ETH910TW-1","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426298429530,"sku":"BWCS-ETH910TW-2","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426298462298,"sku":"BWCS-ETH910TW-3","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ETH910TW-1.webp?v=1779930583","url":"https:\/\/batteryweb.com\/products\/airbus-thr9-replacement-battery-37v-5200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}