Laptop Battery for ASUS S4500F U4500F BX431FA UX431FL C21N1833 11.55V 48Wh, High Capacity, 1-Year Warranty

**Product Overview**
This high-performance replacement battery is specifically designed for select ASUS laptop models including S4500F, U4500F, BX431FA, and UX431FL. It uses premium-grade lithium-ion cells to deliver stable power output, longer battery life, and consistent performance. Whether you are working, studying, or streaming, this battery keeps your device running without unexpected shutdowns.

**Important Voltage Warning**
Please confirm that your original battery is 11.55V before purchasing. Using an incorrect voltage battery may damage your laptop or cause safety hazards. This battery is NOT compatible with 7.6V, 14.4V, or 15.2V models.

**Compatible Laptop Models (including but not limited to) **
- ASUS S4500F
- ASUS U4500F
- ASUS BX431FA
- ASUS UX431FL
- ASUS S4500
- ASUS U4500
- Other models using C21N1833 battery

**Compatible Battery Part Numbers**
- C21N1833

**Specifications**
| Parameter | Value |
|-----------|-------|
| Battery Type | Li-ion |
| Voltage | 11.55V |
| Capacity | 48Wh |
| Cell Count | 4 cells |
| Color | Black |
| Weight | Approx. 250g |
| Warranty | 1 Year |

**Comparison Table**
| Feature | Our Battery | Generic Battery |
|---------|-------------|----------------|
| Capacity | 48Wh | Often 42Wh or lower |
| Protection | Overcharge/Over-discharge/Short circuit/Overheat | Basic or none |
| Cell Grade | Grade A lithium-ion | Mixed or Grade B |
| Warranty | 1 Year | 6 months or less |

**Installation Tips**
1. Power off your laptop and unplug the AC adapter.
2. Remove the bottom cover (screwdriver may be required).
3. Disconnect the old battery cable and remove the battery.
4. Insert the new battery, reconnect the cable, and replace the cover.
5. Charge the battery fully before first use for optimal performance.

**Safety & Quality**
Each battery undergoes strict quality control and safety testing. Our cells are certified with CE, FCC, and RoHS standards. We recommend using the original ASUS charger for best results.

**Package Includes**
- 1 x Replacement Battery (C21N1833)


**Note**
- Do not disassemble, puncture, or expose the battery to high temperatures.
- Recycle old batteries according to local regulations.
- If you are unsure about compatibility, please contact us with your laptop model or original battery part number.