{"product_id":"rollei-action-cam-420-replacement-battery-37v-950mah-li-ion","title":"Rollei Action Cam 420 Compatible Battery 3.7V 950mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRollei Action Cam 420 — 3.7V Li-ion Replacement Battery (RL420B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 950mAh Li-ion cell for the Rollei Action Cam 420 (also listed as Actioncam 420 and AC420). It replaces OEM part RL420B and fits the same compact battery bay in all three model name variants. Capacity is 950mAh — identical to the original spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAC420 \/ Action Cam 420 \/ Actioncam 420 fit:\u003c\/strong\u003e\n    All three names refer to the same hardware platform. The battery bay dimensions, connector pin-out, and BMS voltage thresholds are identical across the naming variants, so one cell covers all three.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the AC420 body and OEM charger. The BMS accepted charge handshake on the first insertion, reached full charge voltage without trip events, and the camera body reported battery status correctly throughout discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use charge cycle on AC420:\u003c\/strong\u003e\n    Run one full charge cycle through the camera body or OEM charger before heavy recording. The AC420 BMS maps its battery-remaining display to a known voltage curve — skipping this step can cause the indicator to read inaccurately until the cell completes at least one full cycle from within the camera.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAC420 battery indicator jumping erratically after fitting a replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe AC420 maps its battery percentage display to fixed voltage thresholds calibrated against the original cell's discharge curve. A new cell discharges slightly differently during its first few cycles, which causes the indicator to skip between readings rather than drop smoothly. This is a display calibration issue, not a cell fault. Run two to three full charge and discharge cycles through the camera body, and the indicator will track the new cell's curve accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAC420 showing no battery or refusing to power on with a charged replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the camera displays no battery or fails to boot after fitting this cell, the BMS has not yet completed its initial handshake with the new cell. This happens when a replacement cell arrives at a storage voltage below the camera's minimum boot threshold — typically under 3.0V. Place the cell in the OEM charger or a compatible external Li-ion charger and bring it to at least 3.6V, then reinsert. The camera should boot normally at that voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333764218970,"sku":"BWCS-GDB002MC-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333764251738,"sku":"BWCS-GDB002MC-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333764284506,"sku":"BWCS-GDB002MC-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GDB002MC-1.webp?v=1778213068","url":"https:\/\/batteryweb.com\/products\/rollei-action-cam-420-replacement-battery-37v-950mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}