Brand: ASUS

Factory Part Number (P/N): C31-X402

Compatible Models: S300 S400C S400CA S400E X402C F402C

Label Capacity: 11.4V-44Wh-4000mAh

Cell Configuration: 3 cells

Real Capacity: 4200mAh

Get premium-quality replacement batteries for your device. Guaranteed safety, power, and performance!

Price Start From 1500 ৳

We Repair Original Laptop Batteries – New Batteries Also Available!

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The C31-X402 is compatible with S300 S400C S400CA S400E X402C F402C. We offer top-tier laptop batteries built for reliability and endurance.

High-Performance Laptop Battery Replacement – Reliable Power for Your Device

Looking for a durable and reliable replacement battery for your laptop? Our premium-quality laptop batteries are designed to deliver long-lasting performance, extended battery life, and full compatibility with your device. Whether you’re replacing an old battery or upgrading for better performance, this battery ensures seamless integration and powerful results.

Brand: ASUS

Factory Part Number (P/N): C31-X402

Compatible Models: S300 S400C S400CA S400E X402C F402C

Label Capacity: 11.4V-44Wh-4000mAh

Cell Configuration: 3 cells

Real Capacity: 4200mAh

Get premium-quality replacement batteries for your device. Guaranteed safety, power, and performance!

Built with top-grade cells and strict quality control, this battery guarantees safety, stability, and power when you need it most. Ideal for professionals, students, and anyone on the go.

🔋 Why Choose Our Batteries?

  • 100% compatible with OEM standards
  • Overcharge and short-circuit protection
  • Certified for safety and efficiency
  • Backed by warranty and customer support

Replace your battery with confidence and restore your laptop’s original performance.

Frequently Asked Questions
ASUS S300 S400C S400CA S400E X402C F402C Battery

The C31-X402 is compatible with S300 S400C S400CA S400E X402C F402C. We offer top-tier laptop batteries built for reliability and endurance.

We provide high-quality replacement batteries that meet or exceed OEM specifications. All batteries are tested for performance, safety, and durability.

You can usually find the battery model number printed on your existing battery. Remove the battery from your laptop (if removable) and check the label. Look for a part number (e.g., BN03XL, AC14B8K, etc.).

Label capacity is the advertised capacity printed on the battery. Real capacity refers to the actual tested performance, which may vary slightly due to quality control and usage conditions.

Most listings mention the cell configuration (e.g., 3-cell, 4-cell, 6-cell). More cells generally mean longer battery life.

Absolutely. All our batteries come with built-in protection against overcharging, overheating, and short-circuiting. They comply with industry safety standards.

Battery life depends on your laptop usage, settings, and software. On average, you can expect 2–5 hours of usage. Heavy tasks like gaming or video editing may drain the battery faster.

Yes, we provide warranty coverage (e.g., 3, 6, or 12 months) for manufacturing defects. Please refer to the product page for specific warranty terms.

Store the battery in a cool, dry place with about 50% charge. Avoid exposure to direct sunlight, moisture, or extreme temperatures.

Yes, modern batteries are designed to handle charging and usage simultaneously without any damage.