{"product_id":"asus-ul30vt-replacement-battery-148v-4400mah-li-ion","title":"Asus A42-UL30 14.8V Replacement Battery 4400mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus UL30Vt Series — 14.8V Li-ion Replacement Battery (A42-UL30)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.8V, 4400mAh (65.12Wh) Li-ion replacement battery for the Asus UL30Vt and its close variants. It fits the UL30, UL30A, and UL30A-A1 among others using the A42-UL30, A42-UL50, or A42-UL80 OEM part numbers. The connector and cell count match the original pack so the BIOS reads the battery correctly on first boot.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUL30 series compatibility:\u003c\/strong\u003e\n    The UL30, UL50, and UL80 lines share a common four-cell 14.8V battery bay and the same BMS communication protocol. That is why one part number — A42-UL30 — covers all three sub-families. The EEPROM data embedded in this pack matches what the Asus EC firmware expects to see at handshake.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack on a UL30A through a full charge and load cycle. The BMS held charge termination at 16.8V as expected, and the fuel gauge IC reported capacity within normal variance. No false low-battery shutdowns triggered during the test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle reset for UL30Vt:\u003c\/strong\u003e\n    After fitting this battery, discharge the laptop to hibernate cutoff under normal use, then charge uninterrupted to 100% without using the machine. This gives the UL30Vt's battery learn cycle a clean baseline and clears the inaccurate health warning that appears 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 UL30Vt BIOS flags a new battery as poor health\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Asus EC firmware reads health data from the pack's EEPROM, not from live cell measurements. A new cell ships with cycle count and wear data zeroed out, which the BIOS interprets as a mismatch against the original battery's stored profile. This produces a \"battery not detected\" or \"poor health\" warning on first boot even when the pack is electrically sound. Running one full discharge-to-hibernate then a full uninterrupted charge resets the learn cycle and clears the warning. If it persists after two full cycles, check the BIOS is on the latest firmware version.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUL30Vt shutting down at 20–30% charge shown\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 discharge curve. The gauge was trained on the old, degraded cell, so it miscalculates the voltage cliff point on the replacement. Under full CPU plus display load the new cell's voltage drops faster than the gauge predicts, triggering an emergency shutdown before the displayed percentage reaches zero. Two to three full discharge-and-charge cycles recalibrate the gauge. After the third cycle, the cutoff should stabilise at or below 5% displayed charge, around 14.4V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410806472794,"sku":"BWCS-AUL30NB-1","price":112.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410806505562,"sku":"BWCS-AUL30NB-2","price":128.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410806538330,"sku":"BWCS-AUL30NB-3","price":140.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AUL30NB-1.webp?v=1779581141","url":"https:\/\/batteryweb.com\/products\/asus-ul30vt-replacement-battery-148v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}