Battery for ASUS FL5900U C21N1509 A556U K556U X556U F556U Series 11.4V 38Wh 3800mAh, High Capacity, 2-Year Warranty

**Product Description**

Upgrade your ASUS laptop with this high-performance replacement battery, specifically designed for the FL5900U, A556U, K556U, X556U, and F556U series. Whether you are a student, professional, or home user, this battery provides the dependable power you need to stay productive on the go.

**Important Voltage Warning**
Please confirm your original battery voltage before purchasing. This battery is 11.4V. Do not use it with laptops requiring 7.6V or 14.8V batteries, as it may cause damage or safety hazards. Always match the voltage exactly.

**Compatible Laptop Models (including but not limited to): **
- ASUS FL5900U / FL5900UQ / FL5900UR
- ASUS A556U / A556UA / A556UB
- ASUS K556U / K556UA / K556UB
- ASUS X556U / X556UA / X556UB
- ASUS F556U / F556UA / F556UB

**Replaces Original Part Numbers: **
C21N1509, C21N1509-1, C21N1509-2

**Specifications Table: **

| Specification |

Details

|
| --- | --- |
| Battery Type | Lithium-ion (Li-ion) |
| Voltage | 11.4V |
| Capacity | 3800mAh / 38Wh |
| Cell Quality | Grade A Certified |
| Color | Black |
| Weight | Approx. 250g |
| Dimensions | 270 x 60 x 5.5 mm (may vary slightly) |
| Warranty | 2 Years |

**Comparison Table (Original vs.
Replacement): **

| Feature | Original ASUS Battery | Our Replacement Battery |
| --- | --- | --- |
| Voltage | 11.4V | 11.4V (Exact Match) |
| Capacity | 3800mAh / 38Wh | 3800mAh / 38Wh (Same) |
| Cell Grade | Standard | Grade A (Higher Reliability) |
| Safety Protection | Basic | Overcharge/Discharge/Short Circuit/Temp |
| Warranty | 1 Year (Typical) | 2 Years (Extended) |
| Price | High | Affordable |

**Installation Tips: **

1. Turn off your laptop and unplug the AC adapter.

2. Remove the back cover (screws may be required refer to your laptop manual).

3. Disconnect the old battery cable and remove the battery.

4. Insert the new battery, connect the cable, and replace the cover.

5. Charge the battery fully before first use for optimal performance.

**Note: ** If your laptop does not charge or recognize the battery, please ensure the connection is secure and the voltage matches. Contact us if you need further assistance.

**Package Includes: **
- 1 x Replacement Battery


**Quality & Safety**
Every battery undergoes strict quality control and safety testing. We use only Grade A cells to ensure long cycle life and stable performance. Your satisfaction is our priority.

Order now and give your ASUS laptop a new lease on life!