Asus ZenBook UX501VW Replacement Battery C32N1523 11.4V 8200mAh

Asus ZenBook UX501VW Series — 11.4V Li-Polymer Replacement Battery (C32N1523)

This 11.4V, 8200mAh (93.48Wh) lithium-polymer battery replaces the original C32N1523 cell in the Asus ZenBook UX501VW series. It fits the UX501VW-FY062T, FJ128T, FY145T, FY057R, and more than 19 additional UX501VW variants. Voltage and connector match the original, so no modifications are needed at the bay.

• UX501VW platform fit: All UX501VW variants share the same 11.4V three-cell Li-Polymer architecture, the same 14-pin SMBus connector, and the same BMS handshake protocol. That uniform electrical spec across the lineup is why one cell covers the full range of models listed.
• Bench tested on actual hardware: We ran this cell on a UX501VW board under a combined CPU-plus-display load. The BMS held the charge curve without tripping overcurrent protection, and the SMBus communication returned correct status codes throughout the discharge cycle.
• Post-install calibration on the UX501VW: After fitting this cell, run one full discharge down to 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.

Why the UX501VW BIOS reports poor battery health after a cell swap

The UX501VW stores capacity and cycle data in EEPROM on the battery's protection circuit. When a new cell arrives, that EEPROM holds rated values that don't yet match what the fuel gauge IC has measured against the actual chemistry. The BIOS reads that mismatch and flags the battery as degraded or unknown — even when the cell is physically new. One complete discharge-to-hibernate followed by an uninterrupted full charge gives the fuel gauge IC enough data to overwrite the stale EEPROM baseline. After two to three cycles, the health readout in MyASUS and the BIOS normalise.

Laptop cuts off at 20–30% remaining after battery swap

This is a voltage cliff, not a capacity fault. Under full CPU plus display load the UX501VW draws enough current that a partially discharged Li-Polymer cell dips below the BMS cutoff threshold before the fuel gauge reaches zero. The fuel gauge IC hasn't yet mapped the new cell's actual discharge curve, so it over-reports remaining charge right up to the cliff edge. Run two full calibration cycles — discharge to hibernate, charge to 100% each time — and the fuel gauge IC recalculates the curve against the new cell. After calibration, shutdown should not occur above 5–8% under normal load.