{"product_id":"medion-e5211-replacement-battery-111v-6600mah-li-ion","title":"Medion E5211 11.1V Replacement Battery BTP-BAK8 6600mAh","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 is an 11.1V, 6600mAh (73.26Wh) lithium-ion battery that replaces the original cell in the Medion Akoya E5211, E5214, E5218, and MD97132 series notebooks. It uses OEM part number BTP-BAK8 and cross-references BTP-B4K8, BTP-B7K8, BTP-C0K8, and several Fujitsu-Siemens board codes including S26391-F400-L400. If the original cell has stopped holding charge or the system reports degraded health, this is the direct physical replacement.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAkoya E5211 \/ E5214 \/ E5218 compatibility:\u003c\/strong\u003e\n    These models share the same 11.1V three-cell battery rail, identical connector pinout, and the same BMS handshake protocol. The cross-reference list covers both the BTP-Bxx and BTP-Cxx part families, which Medion and Fujitsu-Siemens used interchangeably across production runs of this chassis.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on an E5211 chassis. The BMS initialised correctly, the BIOS accepted the cell without an unknown battery warning, and the fuel gauge tracked state of charge accurately after two calibration cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install discharge cycle:\u003c\/strong\u003e\n    After fitting this battery, run the laptop unplugged until it reaches hibernate cutoff — do not interrupt it. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as poor immediately after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Akoya E5211 BIOS reads health data from EEPROM stored on the original cell. When a new cell installs, the EEPROM presents zero cycle history and a different rated Wh figure, which the BIOS interprets as a fault rather than a fresh cell. This is not a defect in the replacement battery. Run one complete discharge-to-hibernate cycle followed by a full uninterrupted charge. After one to two cycles the fuel gauge IC recalibrates against the new cell chemistry and the health warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load before the fuel gauge reaches zero. It is a calibration mismatch, not a weak cell. The fuel gauge IC learned its discharge curve from the old degraded cell and is mapping it incorrectly onto the new one. Discharge fully to hibernate cutoff twice in a row, charging to 100% each time in between, and the shutdown point will shift back to the correct low-battery threshold near 5–7% and 10.5V per cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409823498330,"sku":"BWCS-FU1720HB-1","price":125.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409823531098,"sku":"BWCS-FU1720HB-2","price":145.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409823563866,"sku":"BWCS-FU1720HB-3","price":158.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FU1720HB-1.webp?v=1779581114","url":"https:\/\/batteryweb.com\/products\/medion-e5211-replacement-battery-111v-6600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}