{"product_id":"redmi-a5-4g-replacement-battery-385v-5100mah-li-polymer","title":"BP5E Redmi A5 4G Replacement Battery 3.85V 5100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRedmi A5 4G — 3.85V Li-Polymer Replacement Battery (BP5E)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 5100mAh (19.64Wh) Li-Polymer battery replaces the OEM BP5E cell in the Redmi A5 4G smartphone. It fits the A5 4G directly and restores power to the processor, display, modem, and all onboard functions. Install it when the original cell no longer holds charge or the phone shuts down unexpectedly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA5 4G platform fit:\u003c\/strong\u003e\n    The BP5E connector, contact layout, and BMS handshake are specific to the Redmi A5 4G chassis. The replacement cell matches those parameters so the phone's charge IC and fuel gauge IC can communicate with the battery normally.\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 A5 4G platform. The BMS accepted the charge IC handshake on the first cycle, and charge current ramped correctly through CC and CV phases without interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current fast charging introduces load the IC hasn't yet measured.\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 Redmi A5 4G\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell has a slightly different voltage-to-capacity curve than the cell the fuel gauge IC was originally calibrated to. Under modem or display load, the cell voltage drops faster than the IC expects in that 20–30% window, crossing the BMS cutoff threshold while the OS still shows charge remaining. This is a calibration gap, not a faulty cell. One full discharge to automatic shutdown followed by a complete charge at standard rate resets the coulomb counter and closes that gap.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe A5 4G's charge IC uses a handshake over the USB-PD or proprietary charge protocol to negotiate fast charge current with the connected adapter. On the first cycle after a cell swap, the BMS on the new cell may not respond to that negotiation until it has completed one standard-rate charge cycle from a low state. If fast charging is absent after installation, charge the phone once from below 10% to 100% using the standard brick — not a fast charger. Fast charge negotiation typically resumes from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391770558554,"sku":"BWCS-RMA500SL-1","price":38.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43391770591322,"sku":"BWCS-RMA500SL-2","price":45.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43391770624090,"sku":"BWCS-RMA500SL-3","price":49.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RMA500SL-1.webp?v=1779141871","url":"https:\/\/batteryweb.com\/products\/redmi-a5-4g-replacement-battery-385v-5100mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}