{"product_id":"magellan-maestro-4000-replacement-battery-37v-1100mah-li-ion","title":"Magellan Maestro 4000 GPS Replacement Battery 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMagellan Maestro 4000 Series — 3.7V Li-ion Replacement Battery (37-00030-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1100mAh Li-ion cell replaces the original battery in the Magellan Maestro 4000, 4000T, 4010, and 4040 portable GPS navigators. It matches the OEM part numbers 37-00030-001, E4MT181202B12, and MX0708. 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\u003eMaestro 4000 series compatibility:\u003c\/strong\u003e\n    The 4000, 4000T, 4010, and 4040 share the same 3.7V battery bay, connector pinout, and charge circuit. One cell fits all four variants without modification.\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 Maestro platform. The BMS accepted the cell without fault codes, and the charge circuit reached cutoff at 4.2V as expected.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst satellite fix after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it run a full cold-start acquisition. The GPS has no stored almanac data after a full power removal — first fix can take 5–10 minutes. Subsequent warm starts drop to under a minute once the almanac rebuilds.\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 at low battery on the Maestro 4000\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage drops toward the lower end of the discharge curve, some Maestro units reduce RF receiver sensitivity to conserve power. This shows up as fewer satellites locked and a wider position error circle on screen. It is not a software fault — the GPS chipset pulls back deliberately. Keeping the battery above 3.6V under load maintains full receiver sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMaestro 4000 shuts off without warning before the battery indicator empties\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe on-screen battery gauge on the Maestro 4000 is calibrated to the original cell's discharge curve. A new cell — or a degraded one — may not match that curve exactly at low state-of-charge. The device hits its hardware voltage cutoff, typically around 3.3V, before the gauge visually reaches empty. If the unit is cutting out unexpectedly, run two full charge-to-cutoff cycles so the system re-learns the cell's actual discharge profile.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377743626330,"sku":"BWCS-MR4000SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377743659098,"sku":"BWCS-MR4000SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377743691866,"sku":"BWCS-MR4000SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MR4000SL-1.webp?v=1778771938","url":"https:\/\/batteryweb.com\/products\/magellan-maestro-4000-replacement-battery-37v-1100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}