{"product_id":"mini-mini-replacement-battery-3v-50mah-lithium-vanadium-pentoxide","title":"Mini Car Key Remote Replacement Battery 3V 50mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMini Clubman \/ Countryman Key Fob — 3V Lithium Vanadium Pentoxide Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3V, 50mAh lithium vanadium pentoxide cell for Mini, Mini Clubman, and Mini Countryman key fob remotes. It powers the RF transmitter that handles locking, unlocking, and trunk release. Dimensions are 23.60 x 23.60 x 9.50mm — confirm your fob takes this size before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMini key fob platform fit:\u003c\/strong\u003e\n    These three Mini models share the same fob housing, RF circuit voltage requirement, and coin cell format. All three run off the same 3V lithium vanadium pentoxide cell, so one battery spec covers the range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the fob's RF transmitter circuit. The battery held a stable 3V output under repeated signal bursts, and the BMS showed no voltage sag during rapid button presses.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eRolling code re-sync after swap:\u003c\/strong\u003e\n    After fitting this battery, stand within 1 metre of the car and press the lock button 5 times. Removing the old cell interrupts power to the fob's memory, causing a rolling code mismatch — this re-sync step restores communication with the car's receiver module.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Mini fob stops unlocking the car after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMini key fobs use a rolling code system — the fob and the car's body control module stay in sync by incrementing a shared counter on every button press. Cutting power during a battery swap drops the fob's counter out of step with the BCM. The car receives a signal but rejects it because the code doesn't match the expected value. Standing close to the car and pressing the lock button five times forces the BCM to resynchronise with the new code sequence.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFob range noticeably shorter immediately after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium vanadium pentoxide cells ship in storage mode, typically sitting 50–100mV below their nominal 3V working voltage. At that slightly reduced voltage, the RF transmitter produces a weaker signal, which shortens range. This is not a faulty battery. After five to ten normal button presses, the cell reaches full working voltage and range returns to normal. If range stays short after ten uses, check that the battery is seated flat with full contact on both terminals.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339812372570,"sku":"BWCS-VL2330D8-1","price":20.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339812405338,"sku":"BWCS-VL2330D8-2","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339812438106,"sku":"BWCS-VL2330D8-3","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-VL2330D8-1.webp?v=1778366812","url":"https:\/\/batteryweb.com\/products\/mini-mini-replacement-battery-3v-50mah-lithium-vanadium-pentoxide","provider":"BatteryWeb","version":"1.0","type":"link"}