About this replacement
Asus VivoBook S510UQ Series — 11.52V Li-Polymer Replacement Battery (B31N1637)
This 11.52V, 3600mAh (41.47Wh) Li-Polymer battery fits the Asus VivoBook 15 S510UQ and related X510 series notebooks. It replaces OEM part numbers B31Bi9H, B31N1637, and 0B200-02590000 among others. If your original cell no longer holds a charge or your laptop dies unexpectedly during use, this is the direct replacement.
- S510 and X510 series compatibility: The S510UQ, X510UR-3B, and X510UN-1A share the same battery bay dimensions, connector pinout, and BMS handshake protocol. All three models use the B31N1637 cell specification with an identical 3-cell configuration, so one part covers the full lineup.
- Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on an S510UQ unit. The BMS accepted the new cell without error, voltage held steady across load transitions, and the protection circuit triggered correctly at low-cell threshold.
- First-cycle reset on VivoBook firmware: After fitting this battery, discharge the laptop fully until it hibernates, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The VivoBook BIOS stores battery health data in EEPROM tied to the old cell's charge history. When a new cell is fitted, that stored data no longer matches the actual cell state, so the BIOS flags it as degraded. This is a firmware calibration issue, not a fault with the replacement battery. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% to overwrite the stale EEPROM values and re-establish an accurate baseline.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC's stored capacity model no longer matches the actual cell chemistry after a swap. The gauge reports 20–30% remaining, but the cell voltage has already dropped below the load-sustain threshold under combined CPU and display draw. The system shuts down to protect the cell even though the OS shows charge remaining. Two to three full discharge-to-hibernate and full-charge cycles recalibrate the fuel gauge IC against the new cell — after that, the reported percentage and actual cutoff align.