About this replacement
Asus VivoBook Q301LA-BHI5T02 — 7.4V Li-Polymer Replacement Battery (0B200-00580100M)
This is a 7.4V, 5130mAh Li-Polymer replacement battery for the Asus VivoBook Q301LA-BHI5T02 ultrabook. It also fits the VivoBook Q301, Q301L, and S301 series. OEM part numbers are 0B200-00580100M and C21N1309.
- VivoBook Q301 and S301 series compatibility: These models share the same two-cell Li-Polymer pack format, 7.4V voltage rail, and C21N1309 BMS handshake protocol. The connector pinout and physical dimensions are identical across the Q301LA, Q301L, and S301 variants, which is why one cell fits all.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Q301LA unit. The BMS accepted the pack without fault codes, reported accurate voltage at each state of charge, and the charge controller ramped normally from bulk to taper phase without dropping the cell.
- Post-install calibration on the Q301LA: After fitting this cell, run the laptop down to hibernate-cutoff on battery only — no AC — then charge it uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity, clearing the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor immediately after fitting a new cell
The Q301LA stores battery health data in EEPROM tied to the original cell's charge history. When a new cell goes in, the BIOS reads that old data against the fresh cell and flags a health warning — this is a firmware artefact, not a fault with the replacement. The BIOS battery learn cycle is the only fix: discharge fully to hibernate-cutoff, then charge uninterrupted to 100% without interruption. After one or two full cycles, the fuel gauge IC recalibrates and the health warning clears. No BIOS update or third-party tool is needed.
Laptop shuts down at 20–30% charge shown on the status bar
This is a voltage cliff symptom. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC predicts — the laptop hits the low-voltage cutoff threshold while the OS still shows 20–30% remaining. It usually means the fuel gauge IC has not yet calibrated against the new cell's discharge curve. Run two full discharge-to-hibernate and charge-to-100% cycles without interruption. If the shutdown point does not shift after two calibration cycles, check the BIOS battery charge threshold setting — on some Q301LA units this is set to 80% by default and can be adjusted under MyASUS or the BIOS power settings.