{"product_id":"hp-envy-13-ad159tx-replacement-battery-1155v-4350mah-li-polymer","title":"HP Envy 13-AD159TX Compatible Battery AD03XL 11.55V 50.24Wh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHP Envy 13-AD159TX Series — 11.55V Li-Polymer Replacement Battery (AD03XL)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.55V, 4350mAh (50.24Wh) lithium-polymer replacement battery for the HP Envy 13-AD series ultrabook. It fits the Envy 13-AD159TX, AD028UR, AD044TX, AD035TX, and over 220 additional Envy 13-AD variants. OEM cross-references include AD03XL, 921409-271, 921409-2C1, 921439-855, and HSTNN-DB8D.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEnvy 13-AD series compatibility:\u003c\/strong\u003e\n    These models share the same three-cell Li-Polymer architecture, 11.55V nominal rail, and connector pinout. The BMS handshake protocol and EEPROM data structure are consistent across the AD series, so the same cell works across all listed variants without firmware conflict.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an Envy 13-AD unit and confirmed the BMS negotiated charging current correctly, EEPROM data transferred without error codes, and the fuel gauge IC initialised on first boot without triggering a fault state.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the Envy 13-AD:\u003c\/strong\u003e\n    After installing, 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 that commonly 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 poor battery health immediately after swap on the Envy 13-AD\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Envy 13 stores battery health metrics in the EEPROM of the original cell. When a new cell is fitted, the BIOS reads no prior cycle history and flags the battery as degraded or unknown. This is a data gap, not a fault with the replacement cell. Running the BIOS battery learn cycle — one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100% — writes new baseline data and clears the warning. After two to three full cycles, the health indicator should return to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEnvy 13-AD 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 has not yet calibrated against the new cell's actual voltage curve. Under combined CPU and display load, the laptop hits a voltage cliff the old calibration data did not account for, and the system triggers an emergency shutdown before the displayed percentage reaches zero. The fix is to complete two or three full discharge-to-hibernate and full-recharge cycles so the fuel gauge IC maps the new cell accurately. After calibration, shutdowns at falsely high percentages stop — confirm the cell is holding above 10.8V under load before ruling out a deeper BMS issue.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409692393562,"sku":"BWCS-HPE159NB-1","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409692426330,"sku":"BWCS-HPE159NB-2","price":123.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409692459098,"sku":"BWCS-HPE159NB-3","price":134.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HPE159NB-1.webp?v=1779580453","url":"https:\/\/batteryweb.com\/products\/hp-envy-13-ad159tx-replacement-battery-1155v-4350mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}