{"product_id":"tomtom-1ef001703-replacement-battery-37v-800mah-li-ion","title":"TomTom ONE 1EF0.017.03 Compatible Battery 3.7V 800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTomTom ONE 1EF0.017.03 Series — 3.7V Li-ion Replacement Battery (6027A0090721)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 800mAh Li-ion cell that replaces the factory battery in the TomTom ONE and related portable GPS navigators. It fits the 1EF0.017.03, 1ET0.052.09, 4EF00, and 4EF0.017.00 models, along with nine additional variants in the same family. Swap it in when the original cell no longer holds enough charge to complete a journey.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model fit across the TomTom ONE family:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture, connector pinout, and physical footprint — 47 × 34 × 5.5mm — so one cell covers the full range without any wiring modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the TomTom ONE charge circuit and confirmed the protection board trips correctly at both overvoltage and undervoltage thresholds, keeping the GPS receiver and display logic within safe operating range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use satellite acquisition:\u003c\/strong\u003e\n    After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before driving. A full power interruption forces a cold start — expect 5 to 10 minutes for first fix. Subsequent warm starts drop back under a minute once almanac data 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 at low battery on the TomTom ONE\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage drops below roughly 3.5V, some TomTom ONE units reduce receiver sensitivity to protect remaining power for the display and storage write cycles. The visible result is position drift or a wider accuracy circle on screen. This is firmware-controlled, not a hardware fault. Keeping the cell above 3.6V during active navigation maintains full receiver sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTomTom ONE shuts off without warning before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a battery swap, the fuel gauge IC has no charge history for the new cell and applies a generic voltage-to-capacity curve. The device can hit its hard cutoff voltage before the on-screen indicator shows critical. Run two or three full charge-and-discharge cycles to let the gauge recalibrate against the actual cell. Once recalibrated, the low-battery warning should appear well before shutdown at approximately 3.55V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377631199322,"sku":"BWCS-TMS550SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377631232090,"sku":"BWCS-TMS550SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377631264858,"sku":"BWCS-TMS550SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMS550SL-1.webp?v=1778771783","url":"https:\/\/batteryweb.com\/products\/tomtom-1ef001703-replacement-battery-37v-800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}