About this replacement
Asus UX530UQ / UX430UA Series — 11.55V Li-Polymer Replacement Battery (C31N1622)
This is an 11.55V, 4200mAh (48.51Wh) Li-Polymer battery for the Asus VivoBook Pro UX530UQ-FY058R and a wide range of UX530 and UX430 Zenbook models. It replaces OEM part numbers C31N1622, 0B200-02390000, 0B200-02390200, 0B200-02390300, and 31CP5/70/81. If your original cell has degraded or stopped holding charge, this is the direct cell swap.
- UX530 and UX430 platform compatibility: These models share the same three-cell Li-Polymer pack layout, 11.55V voltage rail, and BMS handshake protocol. One part number — C31N1622 — covers the full range because the connector pinout and charge controller communication are identical across these chassis revisions.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on UX530-series hardware. The BMS negotiated correctly with the EC, charge termination triggered at the expected cutoff voltage, and cell balancing across all three cells stayed within tolerance throughout.
- Post-install calibration on the UX530: After fitting this cell, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor after replacement on the UX530
The UX530's embedded controller reads health data from EEPROM registers built into the original battery pack. When a new cell goes in, those registers report different values than what the EC cached from the old unit. The BIOS flags this mismatch as "poor health" or "not installed correctly" even when the new cell is working perfectly. Running one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% prompts the EC to rewrite its cached values against the new cell. After two to three full cycles, health reporting normalises.
UX530 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC loses calibration against the new cell's actual voltage curve. The gauge estimates remaining capacity based on a table built from the old cell — when the new cell's voltage drops under combined CPU and display load, it hits the low-voltage cutoff before the gauge reaches 0%. The laptop cuts power to protect the cell even though the percentage shown still looks safe. Fix this by running two to three full discharge-to-hibernate cycles so the fuel gauge IC relearns the new cell's actual voltage cliff — which typically occurs around 10.2V under load on this pack.