Laptop Battery for ASUS U303U/L UX303/UB/UB6200/LB5200 C31N1339 11.4V 48Wh High Capacity, Compatible with UX303UA UX303UB UX303LN, 1-Year Warranty

**Product Overview**
This high-performance replacement battery is specifically designed for ASUS ZenBook UX303 and U303 series laptops. It uses premium-grade lithium-ion cells to restore your laptops original battery life, allowing you to work, stream, or browse without constantly searching for a power outlet. Whether you need a spare battery for travel or a replacement for a worn-out original, this battery offers reliable, long-lasting power.

**Important Voltage Warning**
Please check your original battery voltage before purchasing. This battery is 11.4V (3-cell series). It is NOT compatible with 7.6V or 14.8V models. Using an incorrect voltage battery may damage your laptop or cause safety hazards. If you are unsure, please verify your original battery model number (e. g., C31N1339) or voltage label.

**Compatible Laptop Models**
- ASUS U303U / U303L / U303LA / U303LB
- ASUS UX303 / UX303UA / UX303UB / UX303LN / UX303LB
- ASUS UB6200 / LB5200
- Also fits: ASUS ZenBook UX303 series with C31N1339 battery slot

**Compatible Battery Part Numbers**
- C31N1339
- 0B200-03190000
- 0B200-03190100
- 0B200-03190200
- 0B200-03190300

**Product Specifications**

| Specification | Value |
| --- | --- |
| Battery Type | Lithium-ion (Li-ion) |
| Voltage | 11.4V (nominal) |
| Capacity | 48Wh / 4200mAh |
| Cell Count | 3 cells |
| Color | Black |
| Weight | Approx. 220g |
| Dimensions | 270 x 70 x 5.5 mm (check fitment) |
| Warranty | 1 Year |

**Comparison Table: Original vs. Replacement**

| Feature | Original ASUS Battery | Our Replacement |
| --- | --- | --- |
| Voltage | 11.4V | 11.4V (exact match) |
| Capacity | 48Wh | 48Wh (same or higher) |
| Cell Grade | OEM | Premium Grade A cells |
| Safety Protection | Yes | Yes (overcharge/discharge/short circuit/temp) |
| Price | High | Affordable |
| Warranty | Limited | 1 Year |

**Installation Tips**
1. Power off your laptop and disconnect the AC adapter.
2. Remove the bottom cover screws (may require a small Phillips screwdriver).
3. Locate the battery connector and gently disconnect the old battery.
4. Remove the old battery and insert the new one, aligning the connector.
5. Secure the bottom cover and power on your laptop.
6. For first use, fully charge the battery to 100% and then discharge to 10% to calibrate.
7. If the battery is not detected, check that the connector is fully seated.

**Package Includes**
- 1 x Replacement Battery (C31N1339 compatible)
- 1 x Installation Guide (English)

**Note**
- Do not disassemble, puncture, or expose the battery to high temperatures.
- Store in a cool, dry place when not in use.
- If your laptop does not charge, please verify compatibility with your original battery model and voltage.

**Customer Support**
We offer 24/7 customer service. If you have any questions about compatibility or installation, please contact us before leaving feedback. Your satisfaction is our priority.