About this replacement
Asus ZenBook Flip 15 UX562FA Series — 15.36V Li-Polymer Replacement Battery (B41N1827)
This is a 15.36V, 3500mAh (53.76Wh) Li-Polymer replacement battery for the Asus ZenBook Flip 15 UX562FA series, including the AC023R, AC034T, and UX562FA-2S variants. It replaces OEM part numbers B41N1827 and 0B200-03070200. The four-cell pack sits flush in the UX562FA chassis and connects via the original BMS-authenticated connector.
- UX562FA platform fit: All UX562FA variants share the same 15.36V four-cell architecture, chassis footprint (201.70 × 190.00 × 8.80mm), and BMS handshake protocol — that is why one cell covers the full model range. A mismatch in voltage rail or connector pinout would prevent charge negotiation entirely.
- Bench tested on actual hardware: We cycled this cell on a UX562FA unit and confirmed the BMS authenticated correctly, charge negotiation completed through all four cells, and no protection-circuit trips occurred across a full charge-to-discharge run under combined CPU and display load.
- First-cycle calibration on the UX562FA: After fitting, 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 appears on EEPROM data carried over from the old cell.
Why the UX562FA shuts down at 20–30% remaining after a battery swap
The ZenBook Flip 15 BIOS maps shutdown thresholds against voltage curves stored from the previous cell. A new cell has a steeper voltage cliff under full CPU-plus-display load than a degraded original. When real cell voltage drops below the BIOS threshold — even though the OS gauge still reads 20–30% — the system cuts power immediately. Running two to three full calibration cycles syncs the fuel gauge IC to the new cell's actual discharge curve and eliminates premature shutdowns. After calibration, the OS reading and real remaining capacity should track within a few percent.
BIOS reporting battery as unknown or 0% immediately after fitting
This happens because the BIOS reads EEPROM data — charge history, cycle count, and rated capacity — from the cell itself. A new cell ships with factory EEPROM values that do not match the old cell's learned data, so the BIOS briefly flags the battery as unknown or shows 0% on first boot. It is not a fault with the replacement cell. Boot into Windows, connect the AC adapter, and allow a full uninterrupted charge to 100% — the BIOS learn cycle will write fresh EEPROM state and the status will resolve to a normal reading. If the warning persists past two full charge cycles, confirm BIOS is on the latest firmware version for the UX562FA.