About this replacement
Asus Chromebook Flip C434 — 11.55V Li-Polymer Replacement Battery (C31N1824)
This is a 11.55V, 4050mAh Li-Polymer battery for the Asus Chromebook Flip C434 2-in-1 convertible. It replaces OEM part numbers C31N1824 and 0B200-03290000. It fits the C434TA series including AI0041, E10013, and AI0045 variants.
- C434TA series fitment: All C434TA variants share the same 11.55V three-cell configuration, connector pinout, and BMS handshake protocol — which is why one battery covers the full model range. Voltage rails and charge termination logic are identical across these SKUs.
- Bench tested on actual hardware: We cycled this cell on a C434TA board and confirmed the BMS negotiated charge termination correctly at 100%, with no false low-voltage cutoffs across repeated discharge runs under combined CPU and display load.
- Post-install calibration on the C434: After fitting, run the battery down until ChromeOS triggers hibernation — do not interrupt it. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
Why the C434 shuts down at 20–30% after a battery swap
The C434's fuel gauge IC calibrates against the original cell's charge curve stored in EEPROM. When a new cell goes in, the IC is still reading against the old cell's data, so the voltage it measures at 20–30% doesn't match what it expects at that state-of-charge. The BMS interprets this mismatch as a voltage cliff and triggers shutdown as a protection event. Running two to three full discharge-to-hibernate cycles recalibrates the IC against the new cell's actual chemistry and eliminates the premature cutoff.
ChromeOS reporting battery health as "Poor" immediately after fitting
The health percentage shown in ChromeOS diagnostics pulls from the EEPROM data the BMS carried over from the worn cell — it does not re-evaluate the new cell until a learn cycle completes. This means a brand-new cell can show 40–60% health on day one, which is a data read error, not a battery fault. Complete the full discharge-to-hibernate then uninterrupted charge sequence described above. After two full cycles, the reported health figure should reset to reflect the actual capacity of the new cell.