Battery for ASUS ZenBook S4100U S4000U X405U B31N1632 11.55V 42Wh, High Capacity, 1-Year Warranty

**Product Overview**
This high-performance replacement battery is specifically designed for ASUS ZenBook S4100U, S4000U, and X405U series laptops. It replaces the original ASUS battery model B31N1632, delivering the same voltage ( 11.55V ) and capacity (42Wh) as the factory part. Whether you need a backup battery or a replacement for a worn-out original, this battery provides reliable power for your daily work, study, and entertainment.

**Important Voltage Warning**
Please verify that your original battery is 11.55V before purchasing. Using an incorrect voltage battery may cause damage to your laptop or battery. This battery is NOT compatible with 7.6V, 14.4V, or 15.2V models. If you are unsure, check the label on your original battery or contact us with your laptop model number.

**Compatible Laptop Models**
- ASUS ZenBook S4100U (S4100U-xxxx series)
- ASUS ZenBook S4000U (S4000U-xxxx series)
- ASUS ZenBook X405U (X405U-xxxx series)
- Also compatible with other ASUS models using B31N1632 battery (please confirm voltage and connector)

**Compatible Original Battery Part Numbers**
- B31N1632
- 0B200-03120000
- C31N1632 (check compatibility)

**Product Specifications**

| Specification |

Details

|
|---------------|---------|
| Battery Type | Lithium-Ion (Li-ion) |
| Voltage | 11.55V |
| Capacity | 42Wh / 3650mAh (typical) |
| Cell Count | 3 cells |
| Color | Black |
| Weight | Approx. 220g |
| Dimensions | 270 x 70 x 5 mm (approx. ) |
| Warranty | 1 Year |

**Comparison Table: Original vs. Replacement**

| Feature | Original ASUS B31N1632 | This Replacement |
|----------|------------------------|------------------|
| Voltage | 11.55V | 11.55V (identical) |
| Capacity | 42Wh | 42Wh (identical) |
| Cell Quality | OEM cells | Grade A cells with safety certification |
| Protection | Basic | Overcharge, over-discharge, short circuit, overheat |
| Price | High | Affordable |
| Warranty | Limited | 1-Year |

**Installation Tips**
1. Turn off your laptop and unplug the AC adapter.
2. Remove the bottom cover (screws may be hidden under rubber feet).
3. Disconnect the old battery cable from the motherboard.
4. Remove the old battery and insert the new one.
5. Connect the cable, replace the cover, and power on.
6. Charge the battery fully before first use for optimal performance.

**Safety & Quality**
Each battery undergoes strict quality control testing before shipping. It meets CE, FCC, and RoHS standards. The built-in smart chip prevents overcharging, overheating, and short circuits, ensuring safe operation in your ASUS laptop.

**Package Includes**
- 1 x Replacement Battery (B31N1632 compatible)
-
- 1 x Installation guide (digital)

**Customer Support**
If you have any questions about compatibility or installation, please contact us. We offer 24/7 customer service and a 30-day hassle-free return policy. Your satisfaction is our priority.