Laptop Battery for ASUS X453 X403M X553MA X503M B21N1329 11.1V 2600mAh/28.86Wh, High Capacity, 1-Year Warranty

**Product Overview**
This high-performance replacement battery is specifically designed for ASUS X453, X403M, X553MA, X503M series laptops. It is a direct drop-in replacement for the original battery model B21N1329, offering the same voltage ( 11.1V ) and capacity (2600mAh / 28.86W h) to restore your laptops original runtime. Whether you need a backup battery or a replacement for an aging or swollen original, this battery provides reliable, long-lasting power for work, study, or entertainment.

**Important Voltage Warning**
Please verify that your original battery voltage is 11.1V (3-cell series). Using a battery with a different voltage (e. g., 7.4V or 14.8V ) may cause damage to your laptop or battery. If you are unsure, check the label on your original battery or consult your laptops manual.

**Compatibility List (Not exhaustive, please confirm your laptop model and battery model)**
- ASUS X453 Series: X453, X453M, X453MA, X453SA
- ASUS X403M Series: X403M, X403MA
- ASUS X553MA Series: X553MA, X553M
- ASUS X503M Series: X503M, X503MA
- Other compatible models: ASUS F553M, F553MA, R453M, R453MA, R503M, R503MA, D453M, D453MA
- Battery model: B21N1329 (also compatible with B21N1329-1, B21N1329-2, B21N1329-3, B21N1329-4)

**Specifications**
| Parameter | Value |
|-----------|-------|
| Battery Type | Li-ion (Lithium-ion) |
| Voltage | 11.1V (3-cell) |
| Capacity | 2600mAh / 28.86W h |
| Cell Count | 3 cells |
| Color | Black |
| Connector | 4-pin (pre-installed cable) |
| Dimensions | Approx. 270 x 40 x 20 mm (check fitment with your laptop) |
| Weight | Approx. 220g |
| Warranty | 1 Year |

**Comparison Table: Original vs. Replacement**
| Feature | Original ASUS Battery | Our Replacement Battery |
|---------|----------------------|------------------------|
| Voltage | 11.1V | 11.1V (identical) |
| Capacity | 2600mAh / 28.86W h | 2600mAh / 28.86W h (same) |
| Cell Type | Li-ion | Li-ion (high-grade cells) |
| Safety Protection | Yes | Yes (overcharge/discharge/short-circuit) |
| Compatibility | B21N1329 only | B21N1329 + multiple ASUS models |
| Warranty | 6 months (typical) | 1 Year (extended) |
| Price | High | Affordable |

**Installation Tips**
1. **Power off** your laptop and disconnect the AC adapter.

2. Remove the battery compartment cover (usually secured by 2-3 screws).

3. Gently disconnect the old batterys cable connector from the motherboard.

4. Remove the old battery and insert the new battery into the compartment.

5. Connect the new batterys cable connector firmly.

6. Replace the cover and screws, then plug in the AC adapter and charge the battery for at least 4 hours before first use.

7. For optimal battery life, avoid fully draining the battery regularly; charge when it drops to 20-30%.

**Note**
- This battery is not compatible with ASUS X453L, X453E, or models using 14.8V batteries.
- If your laptop does not power on after installation, check the cable connection and ensure the battery is properly seated.
- For any compatibility questions, please contact us with your laptop model and original battery model before purchasing.

**Package Includes**
1 x Replacement Battery (B21N1329 compatible)


**Quality & Safety**
Our batteries are manufactured in ISO-certified facilities and pass strict quality control tests including capacity, voltage, and safety checks. Each battery is protected by a smart BMS (Battery Management System) to prevent overcharging, overheating, and short circuits. You can trust this battery for daily use.

**Warranty & Support**
We offer a 1-year warranty and 30-day money-back guarantee. If you encounter any issues, please contact us via eBay/Newegg messaging. We will respond within 24 hours and provide a replacement or refund if necessary. Your satisfaction is our priority.