{"product_id":"medion-akoya-e5211-replacement-battery-111v-4400mah-li-ion","title":"Medion Akoya E5211 11.1V Replacement Battery BTP-BAK8","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMedion Akoya E5211 \/ E5214 \/ E5218 — 11.1V Li-ion Replacement Battery (BTP-BAK8)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V 4400mAh (48.84Wh) Li-ion cell replaces the original battery in the Medion Akoya E5211, E5214, E5218, and MD97132 notebooks. It matches the OEM connector pinout and BMS handshake across all supported models. Voltage and capacity figures are taken directly from product data — not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAkoya E5211 \/ E5214 \/ E5218 platform fit:\u003c\/strong\u003e\n    These three models share the same 11.1V three-cell architecture, connector layout, and BMS communication protocol. One cell covers all of them without any adapter or firmware workaround.\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 live Akoya unit. The BMS completed its handshake without fault codes, and the charge controller accepted the cell without interruption through both phases.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the Akoya platform:\u003c\/strong\u003e\n    After fitting this cell, run the notebook to hibernate-cutoff on battery only — no AC during discharge. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the Akoya BIOS triggers after every cell swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Akoya BIOS reports poor battery health after a new cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Akoya BIOS reads health data from an EEPROM on the battery pack — not from live voltage measurements. When you fit a new cell, that EEPROM carries fresh factory values the BIOS hasn't yet learned. Until a full discharge-to-hibernate and uninterrupted charge cycle is completed, the BIOS has no calibrated reference point for the new cell and flags it as degraded. This is a firmware behaviour, not a cell fault. One complete learn cycle corrects it.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAkoya shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC still holds calibration data from the old, degraded cell. The percentage shown on screen no longer maps accurately to actual cell voltage. Under combined CPU and display load, the cell hits its low-voltage cutoff before the OS-reported percentage reaches zero. To fix it, run the calibration cycle described above — discharge fully to hibernate, then charge uninterrupted to 100%. After two full cycles, the fuel gauge IC recalibrates against the new cell and the cutoff point drops back to below 5% shown.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409827168346,"sku":"BWCS-FU1720NB-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409827201114,"sku":"BWCS-FU1720NB-2","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409827233882,"sku":"BWCS-FU1720NB-3","price":85.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FU1720NB-1.webp?v=1779581113","url":"https:\/\/batteryweb.com\/products\/medion-akoya-e5211-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}