{"product_id":"fortuna-clip-on-bluetooth-gps-replacement-battery-37v-1000mah-li-ion","title":"Fortuna Clip-On GPS Replacement Battery 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFortuna Clip-On Bluetooth GPS — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh (3.7Wh) lithium-ion replacement battery for the Fortuna Clip-On Bluetooth GPS unit. The Clip-On is a wearable Bluetooth GPS tracker that pairs with mobile devices for location and navigation. When the original cell degrades, this replacement restores normal power to the GPS and Bluetooth radios.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eClip-On GPS power rail:\u003c\/strong\u003e\n    The Fortuna Clip-On runs its GPS receiver and Bluetooth stack off a single 3.7V cell. Both radios draw current simultaneously during active tracking, so the cell must sustain voltage under combined load without triggering the BMS undervoltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge while monitoring BMS response under dual-radio load. The protection circuit held cutoff thresholds correctly and did not trip on normal GPS acquisition bursts.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after installation, disable any fast-charge accessories and run one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before reporting percentage to the paired device — skipping this step causes erratic percentage readings early in the battery's life.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Clip-On GPS after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell's voltage drops faster under GPS and Bluetooth combined load than the IC predicts, so reported percentage is ahead of actual cell state. When real cell voltage hits the BMS cutoff threshold, the device shuts off even though the display showed charge remaining. One full discharge-charge cycle resets the coulomb counter and aligns the IC to the new cell. After that cycle, shutdowns at false percentages stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFortuna Clip-On not powering on after sitting in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-ion cells that self-discharge below approximately 2.5V trigger a BMS deep-discharge lockout — the protection circuit disconnects the cell to prevent damage. The device will not respond to the power button or show any sign of life. Connect it to a low-current USB charger and leave it for 15–20 minutes without pressing anything. Once the cell recovers above the BMS re-enable threshold (typically 2.9–3.0V), normal charging resumes and the device powers on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409480548442,"sku":"BWCS-NKB2MX-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409480581210,"sku":"BWCS-NKB2MX-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409480613978,"sku":"BWCS-NKB2MX-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKB2MX_1.webp?v=1778213576","url":"https:\/\/batteryweb.com\/products\/fortuna-clip-on-bluetooth-gps-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}