{"product_id":"magellan-roadmate-rv-9490t-lmb-replacement-battery-37v-1100mah-li-ion","title":"Magellan RoadMate RV 9490T-LMB Compatible Battery 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMagellan RoadMate RV 9490T-LMB — 3.7V Li-ion Replacement Battery (BP-N399-11\/1100)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1100mAh Li-ion cell replaces the original battery in the Magellan RoadMate RV 9490T-LMB portable GPS navigator. It matches the OEM part number BP-N399-11\/1100 and fits the physical cavity and connector on this unit. Capacity is 4.07Wh — identical to the factory specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRoadMate RV 9490T-LMB fit:\u003c\/strong\u003e\n    The 9490T-LMB uses a compact single-cell 3.7V pack with a low-current BMS suited to the GPS receiver and display load. The connector orientation and PCB tab spacing on this replacement match the OEM pack — no modification needed to seat it.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the 9490T-LMB platform. The BMS accepted charge from the unit's internal charging circuit without error flags, and the GPS powered through satellite acquisition without voltage sag tripping a cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start initialisation after fitting:\u003c\/strong\u003e\n    After any full power removal, the 9490T-LMB performs a GPS cold start. Take the unit outdoors and power it on before driving — allow 5 to 10 minutes for first satellite fix. Subsequent warm starts lock in under a minute once the almanac is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced when battery drops below 3.5V\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAt low charge states, the 9490T-LMB scales back receiver sensitivity to reduce current draw from the cell. This shows up as slower re-acquisition in urban canyons or tunnels, and position drift on the map. The GPS is not faulty — it is throttling the RF front end to stay within what the weakened cell can supply. Keep the unit charged above 3.6V during active navigation to hold full receiver performance.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUnit shuts off without a low-battery warning on the screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe battery indicator on the 9490T-LMB is calibrated to the original cell's discharge curve. After a swap, the firmware has not re-learned the new cell's actual capacity, so the voltage threshold for shutdown can be hit before the on-screen indicator reaches the red zone. Charge the replacement cell fully and run two complete discharge cycles through normal use — the indicator recalibrates itself and warning timing returns to normal. If shutdown is still occurring at 3.6V or above, check the connector pins for seating.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377578967130,"sku":"BWCS-MRV940SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377578999898,"sku":"BWCS-MRV940SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377579032666,"sku":"BWCS-MRV940SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRV940SL-1.webp?v=1778771653","url":"https:\/\/batteryweb.com\/products\/magellan-roadmate-rv-9490t-lmb-replacement-battery-37v-1100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}