{"product_id":"xiaomi-redmi-note-11s-replacement-battery-387v-4900mah-li-polymer","title":"Xiaomi Redmi Note 11S Replacement Battery BN5D 3.87V 4900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eXiaomi Redmi Note 11S — 3.87V Li-Polymer Replacement Battery (BN5D)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.87V, 4900mAh (18.96Wh) lithium-polymer cell replaces the BN5D battery in the Xiaomi Redmi Note 11S, Redmi Note 11S 5G, and 22031116BG variants. It restores full device function after the original cell has degraded or failed to hold charge. Capacity figures are taken directly from the OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRedmi Note 11S and 11S 5G compatibility:\u003c\/strong\u003e\n    Both variants use the same BN5D cell footprint, connector pinout, and BMS handshake protocol. The 87.20 × 63.30 × 5.20mm cell dimensions match the chassis cavity on both boards, and the fuel gauge IC communicates over the same data line in both configurations.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a Redmi Note 11S unit. The BMS accepted the charge IC handshake without error flags, and the fuel gauge IC tracked state-of-charge correctly after one full calibration cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into 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\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a discharge curve the fuel gauge IC has never seen. When the screen or modem draws a high current spike, the cell voltage drops below the BMS cutoff threshold even though the OS still shows charge remaining. The BMS interprets the voltage sag as an empty cell and shuts the device down. One full discharge-to-zero followed by an uninterrupted charge to 100% recalibrates the coulomb counter and eliminates most of these premature shutdowns.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eXiaomi's proprietary fast charge protocol requires the charge IC to verify BMS state before unlocking high-current delivery. On a new cell with no charge history, the BMS may respond with a conservative state that causes the charge IC to fall back to standard 5V charging. This is not a fault — it resolves after the first full cycle. If fast charge still does not activate after the second cycle, check the USB-C port for debris and verify the cable supports the required current rating.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391845007450,"sku":"BWCS-MUN511SL-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391845040218,"sku":"BWCS-MUN511SL-2","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391845072986,"sku":"BWCS-MUN511SL-3","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUN511SL-1.webp?v=1779142367","url":"https:\/\/batteryweb.com\/products\/xiaomi-redmi-note-11s-replacement-battery-387v-4900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}