{"product_id":"icom-ic-a3-replacement-battery-12v-1000mah-ni-mh","title":"Icom CM-166 12V Ni-MH Compatible Battery IC-A3 Aviation Radio","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIcom IC-A3 \/ IC-A22 Series — 12V Ni-MH Replacement Battery (CM-166)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V 1000mAh Ni-MH replacement battery pack for the Icom IC-A3, IC-A3E, IC-A22, and IC-A22E portable aviation transceivers. It replaces OEM part numbers CM-166, CM-166S, and BP-166. Capacity figure is taken directly from product data — 12Wh total energy.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIC-A3 and IC-A22 platform fit:\u003c\/strong\u003e\n    Both the A3 and A22 variants run the same 12V battery rail, share the same physical connector, and use the same BMS handshake protocol — one pack covers the full series without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through transmit loads on the IC-A22 platform. The BMS handled PTT current spikes without tripping, and the charger dock accepted the pack cleanly after a standard contact cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst insertion into the charger dock:\u003c\/strong\u003e\n    If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Icom dock requires a clean contact cycle to complete the BMS handshake before charging begins — this is not a defective pack.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eIC-A3 bar indicator reading low on a brand-new CM-166 pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells ship at storage voltage, typically around 1.0–1.1V per cell, not at full charge. The IC-A3 uses a voltage-threshold bar indicator, so a pack at storage voltage will display fewer bars than expected — sometimes just one. This does not mean the pack is faulty. Run a full charge cycle through the dock first, then check the bar reading again at full voltage before drawing any conclusions.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRadio cuts out mid-transmission on the IC-A22 with a new pack fitted\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMid-transmission cutout on a new pack is almost always a BMS overcurrent trip triggered by the PTT transmit current spike. Ni-MH packs that haven't completed a conditioning cycle can have higher internal impedance, which causes a voltage sag under RF output load. The BMS interprets the sag as an overcurrent event and cuts the output. Complete one full charge-discharge cycle through the dock, confirm resting voltage sits at or above 13.2V after charge, then test PTT again.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426352922714,"sku":"BWCS-ICM166TW-1","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426352955482,"sku":"BWCS-ICM166TW-2","price":60.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426352988250,"sku":"BWCS-ICM166TW-3","price":67.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ICM166TW-1.webp?v=1779930808","url":"https:\/\/batteryweb.com\/products\/icom-ic-a3-replacement-battery-12v-1000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}