{"product_id":"artfone-cf241a-replacement-battery-37v-900mah-li-ion","title":"Artfone CF241A Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eArtfone CF241A \/ CS181 \/ CS181A — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh (3.33Wh) Li-ion cell that replaces the original battery in the Artfone CF241A, CS181, and CS181A. All three models share the same battery bay dimensions (53.00 × 34.00 × 4.80mm) and voltage rail. Fit the cell, close the cover, and the phone powers on normally.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCF241A, CS181, and CS181A compatibility:\u003c\/strong\u003e\n    These three Artfone models run the same 3.7V single-cell architecture with an identical connector pinout and physical footprint. The BMS on each device accepts this cell without configuration changes.\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 CF241A platform. The charge IC accepted the cell on the first cycle, BMS protection tripped correctly at low-voltage cutoff, and the fuel gauge IC began tracking state-of-charge without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable any fast-charge mode and run one complete discharge-to-charge cycle before normal use. The fuel gauge IC on these Artfone models calibrates its discharge curve against the first full cycle — skipping this step leaves the coulomb counter reading against the old cell's curve.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the CF241A reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the CF241A stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads voltage, maps it to the old curve, and displays an inaccurate percentage. One full discharge-charge cycle overwrites the stored curve and realigns the coulomb counter to the new cell's behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC still references a degraded cell's voltage curve. As load increases — screen backlight, network polling — the new cell's voltage drops briefly below the threshold the phone expects at that reported percentage. The system interprets this as a critical low-voltage event and shuts down. Run one complete calibration cycle first. If shutdowns persist after calibration, check that the display percentage stabilises above 3.6V under moderate load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391802474586,"sku":"BWCS-BRD420SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391802507354,"sku":"BWCS-BRD420SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391802540122,"sku":"BWCS-BRD420SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BRD420SL-1.webp?v=1779142181","url":"https:\/\/batteryweb.com\/products\/artfone-cf241a-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}