{"product_id":"redmi-go-replacement-battery-385v-2900mah-li-polymer","title":"BN3A Redmi Go Compatible Battery 3.85V 2900mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRedmi Go (M1903C3GH \/ M1903C3GG) — 3.85V Li-Polymer Replacement Battery (BN3A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2900mAh (11.17Wh) Li-Polymer replacement battery for the Redmi Go smartphone. It fits the M1903C3GH and M1903C3GG variants and replaces OEM part BN3A. Install it when the original cell has degraded, won't hold charge, or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRedmi Go variant compatibility:\u003c\/strong\u003e\n    The M1903C3GH and M1903C3GG share the same battery bay dimensions, connector pinout, and BMS handshake protocol — both accept the BN3A cell without modification. The 3.85V nominal rail matches the charge IC on both boards.\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 Redmi Go unit. The BMS accepted charge from both standard 5V\/1A and 5V\/2A inputs without fault flags. Voltage held stable under simultaneous screen-on and LTE load.\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 for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Redmi Go reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Redmi Go uses a coulomb counter IC that builds its charge map from cycles on the original cell. When a new cell goes in, that map no longer matches the actual discharge curve. The phone reads percentage from a stale reference table, so it can show 40% and then jump to 15% without warning. One full discharge to automatic shutdown, followed by a full charge to 100%, resets the counter and aligns the gauge to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% charge remaining\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity problem. Under combined modem and display load, cell voltage drops sharply at lower states of charge — faster than the fuel gauge IC anticipates. When voltage sags below the shutdown threshold (typically around 3.4V), the phone cuts power even though the gauge still shows 20–30%. The fix is the same recalibration cycle: one full discharge to auto-shutdown, then charge uninterrupted to 100% with the phone off or in flight mode to reduce load during the first cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391993610330,"sku":"BWCS-MUM130SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391993643098,"sku":"BWCS-MUM130SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391993675866,"sku":"BWCS-MUM130SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUM130SL-1.webp?v=1779142762","url":"https:\/\/batteryweb.com\/products\/redmi-go-replacement-battery-385v-2900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}