{"product_id":"dell-xps-14z-replacement-battery-148v-3900mah-li-polymer","title":"Dell XPS 14z Replacement Battery 14.8V 3900mAh V79Y0","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDell XPS 14z — 14.8V Li-Polymer Replacement Battery (V79Y0)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.8V, 3900mAh (57.72Wh) Li-Polymer replacement battery for the Dell XPS 14z ultrabook. It fits the XPS 14Z-L412X, XPS 14Z-L412Z, and the broader XPS 14Z Ultrabook line. OEM part numbers V79Y0, YMYF6, and 0YMYF6 all cross-reference to this cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eXPS 14z series fit:\u003c\/strong\u003e\n    The L412X and L412Z share the same 14.8V four-cell configuration, connector pinout, and BMS handshake protocol. A single cell revision covers both chassis variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge, discharge, and load cycles on an XPS 14z unit. The BMS communicated correctly with the EC, reported accurate state-of-charge to the OS, and held voltage within expected range under CPU and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the XPS 14z:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the EC flags 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\"\u003eBIOS reporting poor battery health immediately after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Dell EC reads EEPROM data embedded in the original cell's BMS and stores it as a baseline. When a new cell arrives, the EC compares the new cell's reported cycle count and charge history against its stored profile — they don't match, so it flags poor health. This is not a fault with the replacement cell. Running the full discharge-to-hibernate then uninterrupted charge cycle forces the EC to re-learn from the new cell's actual data. After one or two complete cycles, the health indicator normalises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eXPS 14z shutting down abruptly at 20–30% charge shown\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the XPS 14z estimates remaining capacity using the old cell's voltage curve. When a new cell is installed, the IC's stored curve no longer matches the actual cell chemistry, so it misreads voltage sag under combined CPU and display load as a critical low. The laptop cuts power before the gauge reaches zero. The fix is calibration: discharge fully until the system hibernates on its own, then charge to 100% without interruption. Repeat this two to three times. After calibration, the gauge tracks the new cell accurately and shutdowns at false lows stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409794498650,"sku":"BWCS-DEXP140NB-1","price":115.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409794531418,"sku":"BWCS-DEXP140NB-2","price":131.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409794564186,"sku":"BWCS-DEXP140NB-3","price":145.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DEXP140NB-1.webp?v=1779580888","url":"https:\/\/batteryweb.com\/products\/dell-xps-14z-replacement-battery-148v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}