{"product_id":"micromax-c250-replacement-battery-37v-900mah-li-ion","title":"Micromax C250 Replacement Battery 3.7V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMicromax C250 — 3.7V Li-ion 900mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 900mAh Li-ion replacement battery for the Micromax C250 smartphone. It fits the original battery bay and connects to the same board-side connector. Capacity is 900mAh (3.33Wh) — exactly as specified in the product data, not an uprated claim.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC250 fitment:\u003c\/strong\u003e\n    The C250 uses a compact 53.00 x 34.00 x 4.80mm cell. This battery matches those dimensions. The BMS communicates over the same two-pin thermistor line the original uses, so the phone reads charge state 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 a C250 board. The BMS held cutoff correctly at both the low-voltage floor and the 4.2V charge ceiling. No thermal events occurred during the test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use after installation, disable fast charging if available and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the OS starts reporting state-of-charge percentages you can trust.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the C250 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe C250's fuel gauge IC stores a discharge curve learned from the original cell over many cycles. When a new cell goes in, that stored curve no longer matches the actual cell chemistry and impedance. The OS reads voltage and translates it to a percentage using the old curve — so the number on screen drifts. One full discharge to auto-shutdown followed by a complete charge to 100% forces the IC to relearn the curve against the new cell.\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 cell voltage drops sharply under modem or display load — a voltage cliff the fuel gauge didn't predict. The phone's protection circuit reads the instantaneous voltage drop as a critical low and cuts power before the OS can log a graceful shutdown. It is not a faulty battery. Run the recalibration cycle described above — one full drain and charge at standard rate — and the gauge will account for that sag. If shutdowns persist after two full cycles, check that the battery connector seats fully, since a high-resistance contact amplifies voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404205850714,"sku":"BWCS-KMC500SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404205883482,"sku":"BWCS-KMC500SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404205916250,"sku":"BWCS-KMC500SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KMC500SL-1.webp?v=1779369391","url":"https:\/\/batteryweb.com\/products\/micromax-c250-replacement-battery-37v-900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}