About this replacement
Asus Zenbook Flip 14 UX462 / UM462 Series — 11.52V Li-Polymer Replacement Battery (B31N1822)
This is an 11.52V, 3600mAh (41.47Wh) Li-Polymer battery for the Asus Zenbook Flip 14 and VivoBook Flip 14 series. It fits the UX462DA-2G, UM462DA, UX461FN, and dozens of related models that share the B31N1822 cell specification. Swap it in when the original cell no longer holds a charge or drops off sharply under load.
- UX462 / UM462 / UX461 platform fit: These models share the same 3-cell Li-Polymer architecture, 11.52V voltage rail, and B31N1822 connector pinout. The BMS handshake matches across the UX462, UM462, and UX461 boards — no firmware mismatch on swap.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the UX462 platform. The BMS accepted the cell without error, balanced all three cells correctly, and held the rated voltage under combined CPU and display load.
- Post-install BIOS learn cycle: After fitting this cell, run the laptop down to hibernate cutoff, then charge it 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.
BIOS reporting poor battery health immediately after replacement
The Asus BIOS reads health data from EEPROM registers written by the original cell. A new cell ships with different EEPROM values, so the BIOS flags it as degraded or unknown — even though the cell is new. This is not a fault with the replacement. One full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the learn cycle data and brings the health indicator back to normal.
Laptop shuts down at 20–30% battery shown on screen
This happens when the fuel gauge IC is still calibrated to the old, degraded cell. The new cell hits a voltage floor the IC misreads as empty, triggering shutdown before the actual capacity is used. The fix is calibration: discharge fully to automatic hibernate, then charge to 100% without interruption. After two to three cycles the fuel gauge IC locks onto the new cell's discharge curve and the shutdowns stop. Check that Windows Battery Saver is not set to trigger at 30% — that setting will also cause early shutdown regardless of cell condition.