{"product_id":"sagem-my-v56-replacement-battery-37v-750mah-li-ion","title":"Sagem MY-V56 Replacement Battery 3.7V 750mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSagem MY-V56 \/ MY-X5-2 Series — 3.7V Li-ion Replacement Battery (188421922)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 750mAh Li-ion cell replaces the original battery in the Sagem MY-V56, MY-X5-2, MYX5-2, MY-X2, and related candybar-style handsets from the same platform. It matches the OEM dimensions of 53.80 × 33.70 × 5.80mm and drops into the same battery bay without modification. Voltage and capacity match the original spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMY-V56 \/ MY-X5-2 platform fit:\u003c\/strong\u003e\n    These models share a common battery bay dimensions, connector pinout, and charge IC handshake voltage. The same cell works across the range because the charge management circuit expects 3.7V nominal with a 4.2V charge ceiling — this cell meets both.\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 a MY-V56 unit. The BMS accepted the charge IC handshake on first connection, charged to 4.2V without interruption, and cutoff terminated correctly at the low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to automatic shutdown, then charge uninterrupted to 100%. The phone's fuel gauge IC calibrated to the old cell's discharge curve — without one full cycle on the new cell, the percentage readout will drift, typically reporting empty well before the cell is actually depleted.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MY-V56 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MY-V56 uses a coulomb-counting fuel gauge IC that builds its charge model from previous cycle history. When you fit a new cell, that stored model no longer matches the actual discharge curve of the replacement. The gauge reads state-of-charge against the wrong reference, so percentages appear inaccurate — often showing 20–30% and then dropping to zero without warning. One full uninterrupted discharge-charge cycle forces the IC to rewrite its reference curve against the new cell. After that cycle, percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shuts off suddenly at 15–25% with the new cell installed\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity problem. At 15–25% state-of-charge, a fresh cell's internal resistance is still slightly elevated on early cycles — when the screen backlight or RF transmit circuit pulls a short high-current burst, cell voltage sags below the BMS cutoff threshold and the phone drops dead. It typically clears within two to three full charge-discharge cycles as the cell conditions and internal resistance drops. After conditioning, confirm the cell holds above 3.5V under load by charging fully and checking the phone holds a stable percentage reading under normal screen-on use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405166018650,"sku":"BWCS-MYV5SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405166051418,"sku":"BWCS-MYV5SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405166084186,"sku":"BWCS-MYV5SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MYV5SL-1.webp?v=1779370333","url":"https:\/\/batteryweb.com\/products\/sagem-my-v56-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}