{"product_id":"dell-bt-gps-bt-309-replacement-battery-37v-1000mah-li-ion","title":"Dell BT GPS BT-309 Replacement Battery 3.7V 1000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDell BT GPS BT-309 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1000mAh Li-ion cell replaces the original battery in the Dell BT GPS BT-309 portable navigator. It fits the BT-309 form factor at 52.02 × 35.09 × 5.26mm and restores power to a unit that no longer holds charge. Use the capacity figure from the product listing — 1000mAh — as your reference point.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBT GPS BT-309 fit:\u003c\/strong\u003e\n    The BT-309 runs a single-cell 3.7V architecture with a compact connector. This cell matches that voltage rail directly. No adapter or rewiring required — the BMS handshake between cell and device operates at the same protection thresholds as the original.\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 a 3.7V single-cell platform. The BMS triggered overcurrent protection correctly at the expected threshold and the cell reached full charge voltage without thermal event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start satellite acquisition after swap:\u003c\/strong\u003e\n    After fitting this cell, power the GPS fully on outdoors before navigating. The unit performs a cold start after any full power interruption. Allow it to acquire a satellite fix — first fix after a cold start typically takes 5–10 minutes, versus under a minute on a warm start 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 BT-309\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage drops toward the lower protection threshold, some GPS receivers reduce RF receiver sensitivity to conserve power. On the BT-309, this can show up as position drift or slower track updates before the device shows a low-battery warning. The fix is straightforward — charge the cell before extended use rather than running it to cutoff. A fully charged 3.7V cell holds position fix quality stable across the full navigation session.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBT-309 shuts off without warning at apparent mid-charge level\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe on-screen battery indicator on the BT-309 reads from a fuel gauge calibrated to the original cell's discharge curve. After a swap, that calibration is off until the unit completes at least one full charge-discharge cycle. The device can hit the hardware voltage cutoff — typically around 3.0V — while the indicator still shows 20–30% remaining. Run one complete cycle from full charge to automatic shutoff, then charge fully again. After that cycle, the displayed level and actual cutoff align reliably.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377722425434,"sku":"BWCS-BT300SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377722458202,"sku":"BWCS-BT300SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377722490970,"sku":"BWCS-BT300SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BT300SL-1.webp?v=1778771839","url":"https:\/\/batteryweb.com\/products\/dell-bt-gps-bt-309-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}