{"product_id":"gateway-md7801u-replacement-battery-111v-8800mah-li-ion","title":"Gateway MD7801u Laptop Replacement Battery 11.1V 8800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGateway MD7801u — 11.1V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V, 8800mAh (97.68Wh) Li-ion battery pack for the Gateway MD7801u notebook. It replaces the original cell when capacity has dropped enough to make unplugged use impractical. Fits the MD7801u directly — no modification needed.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMD7801u platform fit:\u003c\/strong\u003e\n    The MD7801u uses an 11.1V three-cell series configuration. This pack matches that voltage rail and the connector pinout, so the system board communicates with the BMS without throwing unknown-device errors on boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through a full charge-discharge cycle on the MD7801u platform. The BMS handed off charge termination cleanly at 100% and held voltage above 10.5V through the discharge curve without triggering a premature cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the MD7801u:\u003c\/strong\u003e\n    After fitting this pack, run one full discharge until the laptop hibernates on low battery, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after swapping cells.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MD7801u BIOS reports poor battery health after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MD7801u BIOS reads health data from the battery's EEPROM — a small memory chip that stores cycle count, rated capacity, and wear metrics. When you drop in a new pack, that EEPROM data doesn't match the BIOS's stored baseline from the old cell. The system flags the mismatch as degraded health even though the new cell is fresh. One full discharge-to-hibernate followed by a complete charge clears the learn cycle and syncs the BIOS to the new pack's EEPROM values.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMD7801u shutting down at 20–30% battery shown\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't calibrated against the new cell's actual discharge curve. The IC is still using voltage-to-capacity mapping from the old, degraded cell, so it misreads the remaining charge. Under full CPU and display load, the pack hits a voltage point the BIOS treats as empty — even though the gauge shows 20–30%. Run two complete discharge-and-charge cycles without interruption to let the fuel gauge IC re-map the curve against the new chemistry. After the second cycle, the shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409825595482,"sku":"BWCS-AC5520HB-1","price":133.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409825628250,"sku":"BWCS-AC5520HB-2","price":153.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409825661018,"sku":"BWCS-AC5520HB-3","price":169.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AC5520HB-1.webp?v=1779581091","url":"https:\/\/batteryweb.com\/products\/gateway-md7801u-replacement-battery-111v-8800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}