{"product_id":"prestigio-roadrunner-300-replacement-battery-37v-700mah-li-ion","title":"Prestigio RoadRunner 300 Replacement Battery 40B 3.7V 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePrestigio RoadRunner 300 \/ LR-300 — 3.7V Li-ion Replacement Battery (40B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 700mAh Li-ion internal battery for the Prestigio RoadRunner 300 and LR-300 dashcams. It replaces the original part number 40B — the small cell mounted inside the camera body that keeps the unit alive during engine-off parking mode. When this cell degrades, parking mode fails first, then boot-on-ignition becomes unreliable.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRoadRunner 300 and LR-300 fit:\u003c\/strong\u003e\n    Both models share the same internal chassis, connector pinout, and BMS handshake protocol, which is why they run the same 40B cell. The cell dimensions are 40.00 × 31.10 × 5.90mm — tight tolerances inside the dashcam housing, so physical fit matters as much as voltage match.\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 dashcam's own BMS. The protection circuit tripped correctly at the low-voltage cutoff threshold and accepted a full charge without thermal event or overcharge flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst parking-mode calibration cycle:\u003c\/strong\u003e\n    After installing a new internal cell, complete one full drive with the dashcam powered via the hardwire kit or USB before relying on parking mode. The dashcam's capacitor management needs one complete charge cycle against the new cell to calibrate parking mode duration accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the RoadRunner 300 stops recording mid-session in parking mode\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eParking mode on the RoadRunner 300 draws exclusively from the internal 40B cell — there is no vehicle power during this phase. A degraded cell loses usable capacity well before its rated voltage drops, so the dashcam's BMS cuts recording earlier than expected. The BMS monitors cell voltage continuously; once the cell sags below its cutoff threshold, it shuts down the camera to prevent deep discharge damage. A new 700mAh cell restores the full voltage headroom the BMS needs to sustain a complete parking-mode session.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDashcam internal battery hot after a parking-mode session\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe RoadRunner 300 sits inside an enclosed vehicle interior — temperatures climb quickly, especially in direct sun. Sustained parking-mode recording draws a continuous load from a small 700mAh cell inside a sealed housing with no airflow. If the cell feels hot to the touch after a session, that is a sign the original cell's internal resistance has climbed — higher resistance means more heat per milliamp drawn. Replace the cell and check that the dashcam's firmware is current, as newer firmware versions reduce parking-mode frame rate slightly to cut sustained draw on the internal battery.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360106840154,"sku":"BWCS-PRV300SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360106872922,"sku":"BWCS-PRV300SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360106905690,"sku":"BWCS-PRV300SL-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PRV300SL-1.webp?v=1778610877","url":"https:\/\/batteryweb.com\/products\/prestigio-roadrunner-300-replacement-battery-37v-700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}