{"product_id":"sagem-myc-3-replacement-battery-37v-900mah-li-ion","title":"Sagem MYC-3 287024051 Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSagem MYC-3 Series — 3.7V Li-ion Replacement Battery (287024051)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 900mAh Li-ion cell for the Sagem MYC-3 family of compact GSM candybar phones. It fits the MYC-3, MYC-3b, MYC3-2, and MYC32. Capacity matches the original OEM specification at 3.33Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMYC-3 family compatibility:\u003c\/strong\u003e\n    The MYC-3, MYC-3b, MYC3-2, and MYC32 share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. One cell fits all four variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the MYC-3 platform. The BMS held charge cutoff at 4.2V and low-voltage cutoff engaged correctly before cell damage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, disable any fast-charge adapter and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before accepting higher charge current into an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MYC-3 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MYC-3 uses a fuel gauge IC that stores a charge curve calibrated to the original cell. When you fit a new cell, that stored curve no longer matches actual cell behaviour. The IC reads voltage and estimates state-of-charge against outdated data, so the percentage shown on screen drifts from reality. One full discharge down to auto-shutoff followed by a complete charge resets the reference points the IC uses for calculation.\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 GSM modem fires a high-current transmit burst and cell voltage collapses faster than the fuel gauge IC expects. The phone's protection circuit reads the voltage drop as a critical low and cuts power immediately. It is a calibration gap, not a faulty cell. Run two full discharge-charge cycles and confirm the cell stays above 3.6V under screen-on load before flagging a fault.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405243940954,"sku":"BWCS-MYC3SL-1","price":22.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43405243973722,"sku":"BWCS-MYC3SL-2","price":24.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43405244006490,"sku":"BWCS-MYC3SL-3","price":26.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MYC3SL-big.webp?v=1779370350","url":"https:\/\/batteryweb.com\/products\/sagem-myc-3-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}