About this replacement
Asus ZenBook Pro 15 UX535 Series — 15.4V Li-Polymer Replacement Battery (C41N2002)
This is a 15.4V, 4050mAh (62.37Wh) Li-Polymer battery for the Asus ZenBook Pro 15 UX535 lineup. It fits the UX535LH-BN128R, UX535LI-H2006T, UX535LI-E2265T, UX535LI-H2166T, and over 60 additional UX535 variants. OEM part numbers are C41N2002 and 0B200-03770100.
- UX535 platform compatibility: All listed UX535 models share the same 15.4V four-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol — which is why a single cell works across the full range despite differing processor and GPU configurations.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on UX535 hardware. The BMS handshake completed correctly, charge acceptance was normal, and the protection circuit tripped at expected voltage limits on both the high and low ends.
- Post-install calibration on UX535: After fitting this battery, run the laptop down to hibernate cutoff under normal use — do not force-discharge — 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 UX535 models.
Why BIOS reports poor battery health immediately after fitting a new cell
The Asus BIOS reads battery health from EEPROM data stored in the battery's protection circuit board. When a new cell arrives, that EEPROM carries rated factory values that haven't yet been validated against actual charge and discharge behaviour on your specific unit. The BIOS interprets the mismatch as degradation and flags the battery as poor or unknown. Running one complete discharge-to-hibernate then a full uninterrupted charge allows the BIOS learn cycle to write fresh calibration data and clear the warning.
UX535 shutting down at 20–30% charge shown on screen
This is a voltage cliff issue, not a fuel gauge error. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC can track — the battery hits the BMS low-voltage cutoff while the OS still shows 20–30% remaining. It happens most often on UX535LI models with discrete GPUs because the current draw spikes sharply during render or video tasks. Run two full calibration cycles — discharge to hibernate, charge to 100% without interruption — and the fuel gauge IC will recalibrate its discharge curve against the new cell. After calibration, shutdown should not occur above 5–8% reported charge.