{"product_id":"myphone-3350-replacement-battery-37v-900mah-li-ion","title":"MyPhone BS-41 3350 Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMyPhone 3350 \/ Halo 3 \/ Holo A — 3.7V Li-ion Replacement Battery (BS-41)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh (3.33Wh) Li-ion battery for the MyPhone 3350, Halo 3, and Holo A smartphones. It replaces OEM part numbers BS-41, BS-45, and MP-U-2. Fits the original battery bay directly, using the same connector and cell footprint as the factory unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e3350, Halo 3, and Holo A compatibility:\u003c\/strong\u003e\n    All three models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — which is why one cell covers all three. The charge IC on each device negotiates with the same BMS logic, so no firmware differences affect charging behaviour across this group.\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 a MyPhone 3350 unit. The BMS accepted charge from the first cycle, held the cutoff voltage correctly at 4.2V, and the protection circuit tripped cleanly at the low-voltage threshold without triggering a lockout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before any high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MyPhone 3350 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC in these phones stores a learned discharge curve from the original cell. When you install a new cell, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads voltage correctly but translates it against the old profile, so the percentage shown is off. Run one full discharge to shutdown followed by a full uninterrupted charge to 100% — this forces the coulomb counter to reset and build a new reference curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the MyPhone 3350 after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity fault. When the modem fires or the screen backlight peaks, the cell must deliver a short burst of current — if the fuel gauge IC is still running the old calibration curve, the phone doesn't know the cell voltage is about to sag below the cutoff threshold under that load. The BMS cuts power to protect the cell before the displayed percentage reaches zero. Fix this by completing the full recalibration cycle described above — one full discharge to shutdown, then charge to 100% without interruption at standard charge rate.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405024788570,"sku":"BWCS-MY890SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405024821338,"sku":"BWCS-MY890SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405024854106,"sku":"BWCS-MY890SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MY890SL-1.webp?v=1778767243","url":"https:\/\/batteryweb.com\/products\/myphone-3350-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}