{"product_id":"redmi-5a-replacement-battery-385v-2900mah-li-polymer","title":"Redmi 5A BN34 Replacement Battery 3.85V 2900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRedmi 5A \/ M5A — 3.85V Li-Polymer Replacement Battery (BN34)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BN34 is a 3.85V, 2900mAh Li-Polymer cell that fits the Redmi 5A and M5A smartphones. It replaces the internal battery when the original cell has degraded or failed entirely. Capacity is 11.17Wh, matching the original power envelope of the device.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e5A and M5A compatibility:\u003c\/strong\u003e\n    Both model variants use the same BN34 footprint — identical connector pinout, the same 3.85V nominal rail, and the same BMS handshake with the Redmi 5A charge IC. One cell fits both.\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 Redmi 5A platform. The BMS accepted the cell without fault codes, and the charge IC reached full termination voltage without triggering a cutoff error.\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 full discharge-charge cycle before enabling it again. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes into an uncalibrated state.\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 5A after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell has a slightly different voltage-versus-capacity curve compared to the worn cell the fuel gauge IC was calibrated against. When load spikes — from the modem during a call or the display at full brightness — the cell voltage dips below the hardware cutoff threshold even though the OS still shows 20–30% remaining. The phone shuts down to protect the cell, not because it is actually empty. One full discharge-charge cycle with fast charging disabled resets the coulomb counter and clears this behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the BN34 spent time in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-Polymer cells self-discharge in storage. If the BN34 sat below 2.5V before installation, the BMS enters a lockout state and blocks current flow to protect the cell from damage. The phone will not respond to a normal charger plug-in. Connect the device to a low-current 5V USB source and leave it for 15–20 minutes — the charge IC runs a trickle pre-charge mode that slowly brings the cell voltage back above the 2.8V re-enable threshold, after which normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392032047194,"sku":"BWCS-MUR500SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392032079962,"sku":"BWCS-MUR500SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392032112730,"sku":"BWCS-MUR500SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MUR500SL-1.webp?v=1779143030","url":"https:\/\/batteryweb.com\/products\/redmi-5a-replacement-battery-385v-2900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}