{"product_id":"motorola-magone-rtn4000a-replacement-battery-108v-1200mah-ni-mh","title":"Motorola MagOne RTN4000A Replacement Battery 10.8V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola MagOne RTN4000A — 10.8V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 1200mAh Ni-MH replacement battery for the Motorola MagOne RTN4000A two-way radio. It slots directly into the radio's battery bay and connects to the same dock contacts as the original pack. Voltage and capacity match the OEM specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMagOne RTN4000A platform fit:\u003c\/strong\u003e\n    The RTN4000A uses a 10.8V Ni-MH pack with a specific contact layout and BMS handshake sequence. This battery matches that voltage rail and contact geometry, so the charger dock and radio firmware both recognise it as a valid pack on first insertion.\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 that mirror PTT-heavy commercial use. The BMS held the voltage rail steady through repeated transmit current spikes and did not trip into protection mode during any test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-insertion contact check on the RTN4000A dock:\u003c\/strong\u003e\n    If the charger dock shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The MagOne platform requires a clean contact cycle to complete the BMS handshake before charging begins — this is not a faulty cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the RTN4000A cuts out mid-transmission on a new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen PTT is pressed, the radio draws a sharp transmit current spike that can exceed 1A in under a millisecond. A new Ni-MH cell sitting at storage voltage — typically around 10.2–10.4V — can trigger the BMS overcurrent threshold before the cell has warmed up through a few charge cycles. The radio interprets that brief voltage drop as a low-battery condition and interrupts transmission. Running two or three full charge-discharge cycles brings the cells to operating voltage and resolves the cutout.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBar indicator showing one fewer bar than expected on a fresh pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe RTN4000A reads battery level through fixed voltage thresholds, not a fuel gauge chip. A new pack shipped at storage voltage — around 10.2V — sits below the threshold the radio uses to display a full bar reading. This is not a capacity fault. Charge the battery fully before first use and the indicator will reflect actual cell voltage, typically stepping up to the highest bar at or above 10.8V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43426321760346,"sku":"BWCS-UPX500TW-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43426321793114,"sku":"BWCS-UPX500TW-2","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43426321825882,"sku":"BWCS-UPX500TW-3","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UPX500TW-1.webp?v=1779930681","url":"https:\/\/batteryweb.com\/products\/motorola-magone-rtn4000a-replacement-battery-108v-1200mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}