Laptop Battery for ASUS E402M E402MA E402S E402SA B21N1505 11.4V 3800mAh 43Wh, High Capacity, 1-Year Warranty

**Product Overview**
This high-performance replacement battery is specifically designed for ASUS E402M, E402MA, E402S, and E402SA laptops. It is a direct replacement for the original B21N1505 battery, offering the same voltage and capacity to restore your laptops original battery life. Whether you are working, studying, or streaming, this battery provides reliable power to keep you productive.

**Important Voltage Warning**
Please confirm your original battery voltage before purchasing. This battery is 11.4V. Using an incorrect voltage battery may cause damage to your laptop or battery. If your original battery is 7.6V or 14.8V, this product will NOT be compatible.

**Compatible Laptop Models**
- ASUS E402M
- ASUS E402MA
- ASUS E402S
- ASUS E402SA
- Other models using B21N1505 battery

**Replaces Original Battery Part Numbers**
- B21N1505

**Product Specifications**
| Specification |

Details

|
| --- | --- |
| Battery Type | Lithium-Ion (Li-ion) |
| Voltage | 11.4V |
| Capacity | 3800mAh / 43Wh |
| Cell Count | 4 cells |
| Color | Black |
| Weight | Approx. 250g |
| Warranty | 1 Year |

**Comparison Table**
| Feature | Our Battery | Original Battery |
| --- | --- | --- |
| Voltage | 11.4V | 11.4V |
| Capacity | 3800mAh / 43Wh | 3800mAh / 43Wh |
| Safety Protection | Overcharge, over-discharge, short circuit, overheat | Standard |
| Warranty | 1 Year | Varies |
| Price | Competitive | Higher |

**Installation Tips**
1. Turn off your laptop and unplug the AC adapter.
2. Remove the back cover (screws may be required).
3. Disconnect the old battery connector carefully.
4. Remove the old battery and insert the new one.
5. Reconnect the battery connector and close the back cover.
6. Charge the battery fully before first use for optimal performance.

**Package Includes**
- 1 x Replacement Battery


**Note**
This is a third-party replacement battery, not an OEM product. It is fully tested for compatibility and safety. If you have any questions, please contact us before purchasing.