{"product_id":"nintendo-bbe-012-replacement-battery-38v-500mah-li-polymer","title":"Nintendo Switch Joy-Con BEE-004 Replacement Battery 3.8V 500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNintendo BBE-012 \/ Switch 2 Joy-Con 2 — 3.8V Li-Polymer Replacement Battery (BEE-004)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 500mAh lithium-polymer cell replaces the OEM BEE-004 battery inside the Nintendo Switch 2 Joy-Con 2 wireless controller. It fits the BBE-012 controller shell directly, restoring power to a unit that no longer holds a charge or fails to power on. Capacity matches the original Nintendo specification at 500mAh (1.9Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBBE-012 controller family fit:\u003c\/strong\u003e\n    The BBE-012 and Switch 2 Joy-Con 2 share the same battery bay dimensions, connector orientation, and 3.8V charging rail. One cell covers all units in this family without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the BEE-004 replacement through charge and discharge cycles on the BBE-012 platform. The charge IC accepted the new cell without fault flags, and the BMS held the 4.35V ceiling correctly across all test cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge calibration after install:\u003c\/strong\u003e\n    After fitting the new cell, play one full wireless session to automatic controller cutoff before recharging. The Joy-Con 2 fuel gauge IC sets its empty reference point against the first full discharge — skipping this step causes the battery indicator to read inaccurately for weeks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eJoy-Con 2 battery indicator jumping or showing wrong percentage after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Switch 2 uses a fuel gauge IC that builds its capacity model from discharge curve data stored during previous cycles. When you fit a new cell, that stored curve no longer matches the physical cell, so the percentage readout jumps or drops without warning. The IC needs three to five full discharge-and-charge cycles to relearn the new cell's curve. Until recalibration completes, ignore the percentage display and recharge when the controller gives its low-battery alert. After five cycles, the gauge should track within a few percent of actual state.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eController disconnecting before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Joy-Con 2 draws simultaneous current from the wireless radio, motion sensors, and rumble motor. Under that combined load, a partially degraded or freshly installed cell can show a brief voltage sag that drops below the BMS cutoff threshold — even when the fuel gauge still reads 20–30%. The BMS reads actual cell voltage, not the fuel gauge estimate, so it cuts power to protect the cell. If this happens repeatedly on a new replacement cell, run two to three full conditioning cycles first; rated cell voltage under load stabilises after the initial formation cycles. A drop below 3.0V under load is the trigger point to watch.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377528635482,"sku":"BWCS-NTS012SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377528668250,"sku":"BWCS-NTS012SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377528701018,"sku":"BWCS-NTS012SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NTS012SL-1.webp?v=1778767205","url":"https:\/\/batteryweb.com\/products\/nintendo-bbe-012-replacement-battery-38v-500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}