{"product_id":"xiaomi-note-2-premium-edition-replacement-battery-385v-3020mah-li-ion","title":"Xiaomi BM45 Redmi Note 2 Replacement Battery 3.85V 3020mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eXiaomi Note 2 Premium Edition — 3.85V Li-ion Replacement Battery (BM45)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BM45 is a 3020mAh, 3.85V Li-ion cell that powers the Xiaomi Redmi Note 2 Premium Edition and Note 2 Premium Edition Dual SIM (model 2015213). This replacement restores full battery function when the original cell has degraded, swollen, or stopped holding a usable charge. Capacity is 11.63Wh — matching the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNote 2 Premium Edition compatibility:\u003c\/strong\u003e\n    The BM45 fits both the standard and Dual SIM variants of the Note 2 Premium Edition. Both share the same battery bay dimensions (81.60 × 64.90 × 4.20mm), connector pinout, and BMS handshake protocol — one cell covers the full model range.\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 the Note 2 platform. The BMS accepted the cell without error flags, charge termination triggered correctly at 4.35V, and voltage under modem load stayed above the OS shutdown threshold through a full discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, run one full discharge down to automatic shutdown, then charge uninterrupted to 100% before using the device. This lets the coulomb counter IC map the new cell's discharge curve accurately — skipping this step causes the OS to report incorrect percentages for several days.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the BM45 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Redmi Note 2 shuts down when cell voltage drops below roughly 3.4V under load — not when the reported percentage hits zero. A new cell with an uncalibrated fuel gauge IC can show 25% remaining while the actual cell voltage collapses under combined modem, screen, and processor draw. The OS sees a voltage cliff and triggers an emergency shutdown. One full discharge-charge cycle recalibrates the coulomb counter so reported percentage tracks real cell voltage. After calibration, the 3.0V cutoff threshold aligns with the gauge and shutdowns at non-zero percentage stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging not working on the first cycle after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn first connection to a fast charger, the Note 2's charge IC runs a qualification handshake with the new BMS before accepting elevated current. If the BMS hasn't completed its initialisation sequence — which requires the cell voltage to be above approximately 3.0V — the charger falls back to standard 5V\/1A. Charge the phone once at standard speed to bring the cell above 3.5V, then reconnect the fast charger. The handshake completes and elevated charging resumes from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404156305498,"sku":"BWCS-MUM450XL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404156338266,"sku":"BWCS-MUM450XL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404156371034,"sku":"BWCS-MUM450XL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUM450XL-1.webp?v=1779369094","url":"https:\/\/batteryweb.com\/products\/xiaomi-note-2-premium-edition-replacement-battery-385v-3020mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}