About this replacement
Asus ZenBook Flip 14 UX461UA Series — 11.52V Li-Polymer Replacement Battery (C31N1714)
This is an 11.52V, 4850mAh (55.87Wh) lithium-polymer replacement battery for the Asus ZenBook Flip 14 UX461UA-M00540 and over 80 related UX461 convertible ultrabook models. It replaces OEM part numbers C31N1714 and 0B200-02750000. The cell fits the slim 4.10mm battery bay without modification.
- UX461 platform compatibility: The UX461UA, UX461FN, UX461UN, and UX461UA-E1087R share the same 11.52V three-cell architecture and identical connector pinout. The BMS expects the same voltage rails and communication protocol across the entire UX461 family, so one cell covers the range.
- Bench tested on actual hardware: We cycled this cell on a UX461UA unit and monitored BMS handshake, charge curve, and cutoff behaviour. The cell accepted a full charge without triggering protection cutoff, and the BMS reported normal charge state across the cycle.
- Post-install calibration on the UX461UA: 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 a cell swap on this platform.
BIOS reporting poor battery health immediately after replacement
The UX461UA BIOS reads EEPROM data embedded in the battery's BMS chip. When a new cell is installed, that EEPROM data doesn't yet match what the BIOS learned from the original battery, so it flags health as poor or unknown. This isn't a fault with the replacement cell. Run one full discharge-to-hibernate, then a full uninterrupted charge to 100% — the BIOS learn cycle rewrites its baseline against the new cell and the health warning clears.
ZenBook Flip shutting down at 20–30% charge shown
This happens when the fuel gauge IC on the old battery was miscalibrated and the reading carried over to the BIOS estimate. Under full CPU and display load, the actual cell voltage drops below the cutoff threshold before the percentage gauge reaches zero — the laptop shuts down abruptly at what appears to be 20–30%. The fix is a full calibration cycle: discharge to forced hibernate, then charge to 100% without interruption. After two to three cycles the fuel gauge IC recalibrates against the new cell's actual voltage curve and the shutdowns stop.