About this replacement
Asus VivoBook Pro 15 N580 Series — 11.49V Li-Polymer Replacement Battery (C31N1636)
This 11.49V, 4050mAh Li-Polymer battery replaces the OEM C31N1636 cell in the Asus VivoBook Pro 15 and N580 series laptops. It fits the N580GD, N580GD-DM230T, and over 40 additional N580 variants sharing the same connector and BMS handshake. Capacity and chemistry match the original specification exactly.
- N580 platform compatibility: All covered models share the same 11.49V three-cell architecture, physical connector pinout, and BMS communication protocol. The BIOS on these boards reads cell data over SMBus — the replacement cell responds to that handshake correctly without firmware modification.
- Bench tested on actual hardware: We cycled this cell on an N580GD board, confirmed charge acceptance from 0% to 100% without cutoff, and verified the BMS reported cell voltage within normal range across all three cells throughout the charge curve.
- Post-install calibration on the N580: After fitting, run the laptop on battery only until it hibernates at critical charge, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap.
Why the VivoBook Pro 15 BIOS reports poor battery health after a cell swap
The N580 BIOS stores learned capacity data from the previous cell in a persistent register. When a new cell is installed, that stored data does not match the fresh cell's actual charge curve, so the BIOS flags health as degraded immediately. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle and clears the warning. After two to three full cycles, the fuel gauge IC recalibrates and the health status normalises.
VivoBook Pro 15 shutting down at 20–30% shown on the gauge
This happens when the fuel gauge IC is still using capacity data mapped to the old, degraded cell. As the battery discharges under combined CPU and display load, the actual cell voltage drops faster than the stale gauge model predicts — the system hits its low-voltage cutoff while the OS still shows charge remaining. It is not a fault in the new cell. Run two full discharge-to-hibernate cycles, charging to 100% each time, to force the fuel gauge IC to remap against the new cell's actual voltage curve. After recalibration, the gauge and the physical cutoff point will align and shutdowns at 20–30% will stop.