{"product_id":"sagem-myc5-2v-replacement-battery-37v-500mah-li-polymer","title":"Sagem MYC5-2v Replacement Battery 3.7V 500mAh SA6M-SN1","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSagem MYC5-2v \/ VS3 Series — 3.7V Li-Polymer Replacement Battery (SA6M-SN1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 500mAh Li-Polymer cell replaces the original battery in the Sagem MYC5-2v, MYC5-2M, MYC5-2, VS3, and related models. It matches the OEM dimensions at 48.00 × 34.15 × 4.70mm and uses the same connector layout as the factory cell. Capacity is 500mAh (1.85Wh) — identical to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMYC5-2 platform compatibility:\u003c\/strong\u003e\n    The MYC5-2v, MYC5-2M, and VS3 share the same battery bay geometry, connector pinout, and 3.7V nominal rail. One cell covers all these 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 charge and discharge on the MYC5-2 platform and confirmed the BMS accepted the charge handshake correctly. The protection circuit responded to cutoff thresholds at both ends of the voltage range without tripping a fault state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, run one complete discharge-to-charge cycle before relying on the battery percentage readout. The fuel gauge IC on this phone was calibrated to the original cell's discharge curve — one full cycle lets it remap against the new cell and report accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MYC5-2v shuts down suddenly at 20–30% battery remaining\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAn aged or deeply cycled Li-Polymer cell loses its ability to hold voltage under load even when the resting voltage looks fine. On the MYC5-2v, the modem and display pull current simultaneously during calls or screen-on events, causing a voltage cliff that triggers the BMS undervoltage cutoff before the percentage gauge reaches zero. The phone reads 25% and cuts out — not a firmware bug, a cell that can no longer sustain voltage under that load. A replacement cell with an intact discharge curve eliminates this behaviour immediately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMYC5-2v not powering on after sitting in a drawer for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge during storage, and the BMS on this platform locks out below approximately 2.5V per cell to prevent damage. A phone stored flat for several months will often reach that lockout threshold and refuse to respond to a standard charger. Connect the phone to a charger and leave it for 20–30 minutes without attempting to power on — the charge IC needs time to trickle current into the cell before the BMS unlocks and allows normal charging. If the phone still shows no response after that wait, check that the charger is delivering at least 5V before replacing the cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405172703322,"sku":"BWCS-MYC52SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405172736090,"sku":"BWCS-MYC52SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405172768858,"sku":"BWCS-MYC52SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MYC52SL-1.webp?v=1779370333","url":"https:\/\/batteryweb.com\/products\/sagem-myc5-2v-replacement-battery-37v-500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}