Laptop Battery for ASUS S4200U S4200UQ S4000V S410UA R421U, 11.55V 38Wh, B31N1707, B31N1708, High Capacity, 12-Month Warranty

**Product Overview**
This replacement battery is specifically designed for ASUS S4200U, S4200UQ, S4000V, S410UA, and R421U laptop models. It uses high-quality lithium-ion cells to deliver reliable, long-lasting power, ensuring your device stays productive throughout the day. Whether youre working remotely, attending online classes, or enjoying media, this battery provides the consistent performance you need.

**Important Voltage Warning**
Please confirm your original battery voltage before purchasing. This battery is 11.55V. Using an incorrect voltage may cause damage to your laptop or battery. If your original battery is 7.6V or 14.4V, this product will NOT be compatible.

**Compatible Laptop Models**
- ASUS S4200U
- ASUS S4200UQ
- ASUS S4000V
- ASUS S410UA
- ASUS R421U

**Replacement Part Numbers**
- B31N1707
- B31N1708

**Battery Specifications**
| Specification |

Details

|
| --- | --- |
| Voltage | 11.55V |
| Capacity | 38Wh |
| Cell Type | Lithium-ion |
| Color | Black |
| Weight | Approx. 200g |
| Warranty | 12 Months |

**Comparison Table**
| Feature | This Battery | Generic Low-Quality Battery |
| --- | --- | --- |
| Voltage | 11.55V (Exact Match) | Often mismatched ( 7.6V / 14.4V ) |
| Capacity | 38Wh (Standard) | Inconsistent, lower capacity |
| Safety Protection | Overcharge/Discharge/Short Circuit/Over-Temperature | Basic or none |
| Warranty | 12 Months | 3-6 Months or none |
| Certification | CE, RoHS | Uncertified |

**Installation Tips**
1. Power off your laptop and disconnect the AC adapter.
2. Remove the back cover (refer to your laptops service manual if needed).
3. Disconnect the old battery cable and remove the battery.
4. Insert the new battery, reconnect the cable, and replace the cover.
5. Charge the battery fully before first use for optimal performance.
6. If the battery is not recognized, try reseating the connection or restarting the laptop.

**Package Includes**
- 1 x Replacement Battery
- 1 x Installation Guide

**Note**
- Please ensure your laptop model and original battery part number match the list above.
- This battery is not compatible with ASUS S4100U, S4100V, or other series not listed.
- For any questions, contact our support team before purchase. Were here to help!