{"product_id":"samsung-sgh-c400-replacement-battery-37v-850mah-li-ion","title":"Samsung SGH-C400 Replacement Battery 3.7V 850mAh BST3108BE","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung SGH-C400 \/ SGH-E250C Series — 3.7V Li-ion Replacement Battery (BST3108BE)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 850mAh (3.15Wh) Li-ion cell that fits the Samsung SGH-C400, SGH-C408, SGH-E250C, SGH-E258, and over 100 additional Samsung handsets sharing the same battery bay and connector. It replaces OEM parts BST3108BE, AB043446LE, AB043446BE, and related variants. If your original cell no longer holds a charge or the phone won't power on, this is the direct cell swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSGH-C400 and E250C platform fit:\u003c\/strong\u003e\n    These handsets share the same 3.7V single-cell architecture, physical footprint (49.50 × 33.80 × 4.70mm), and edge connector pinout. The BMS handshake on each model expects the same voltage rail, so one cell covers the full compatibility list 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 SGH-series hardware. The BMS accepted the cell without fault flags, voltage held steady at 3.7V nominal, and the protection circuit tripped correctly at the low-voltage cutoff 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 complete discharge down to auto-shutdown, then charge uninterrupted to 100%. The phone's fuel gauge IC was calibrated against the old cell's discharge curve — skipping this step causes the percentage counter to read inaccurately from the start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SGH-C400 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SGH-C400 uses a coulomb-counting fuel gauge IC that builds its capacity model from prior discharge history. When you replace the cell, that history no longer matches the new cell's actual chemistry and internal resistance. The gauge continues using the old curve, so it over- or under-reports remaining charge. One full discharge-to-shutdown followed by a complete uninterrupted charge resets the reference point and brings the percentage display back into alignment with real cell state.\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 because the fuel gauge IC still expects the voltage sag profile of the original, aged cell. The new cell drops voltage more sharply under screen or radio load at lower charge states than the gauge anticipates. When cell voltage falls below roughly 3.4V under load, the BMS trips the protection circuit before the display percentage reaches zero. The fix is the same full discharge-recharge cycle — once the gauge maps the new cell's discharge curve, the shutdown threshold aligns correctly with the displayed percentage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409457119322,"sku":"BWCS-SMX200SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409457152090,"sku":"BWCS-SMX200SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409457184858,"sku":"BWCS-SMX200SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMX200SL-1.webp?v=1779579767","url":"https:\/\/batteryweb.com\/products\/samsung-sgh-c400-replacement-battery-37v-850mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}