Laptop Battery for ASUS S551L V551L R553LN K551LN A551L Series, 11.4V 44Wh 3900mAh, B31N1336, B31N1337, B31N1338, 6-Cell Li-ion, 12-Month Warranty

**Important
Voltage Warning: **
Please check your original batterys voltage before purchasing. This replacement battery is 11.4V. If your original battery is 10.8V or 11.1V, this battery is fully compatible and will work without any issues. If your original battery is a different voltage (e. g., 14.4V or 14.8V ), please do not purchase this item.

**Compatible ASUS Laptop Models (including but not limited to): **
ASUS S551L, S551LA, S551LB, S551LN
ASUS V551L, V551LA, V551LB, V551LN
ASUS R553LN, R553LA, R553LB
ASUS K551LN, K551LA, K551LB
ASUS A551L, A551LA, A551LB, A551LN
*Please note: Not all configurations of these models use the same battery. Always verify your original battery model number before ordering. *

**Replacement Battery Model Numbers: **
B31N1336, B31N1337, B31N1338

**Specifications: **
- Chemistry: Lithium-ion (Li-ion)
- Voltage: 11.4V
- Capacity: 44Wh / 3900mAh
- Cells: 6-cell
- Color: Black
- Weight: Approx. 300g
- Certifications: CE, FCC, RoHS

**Comparison Table: **

| Feature | Our Battery | Generic/Cheap Batteries |
|------------------------|-----------------------------|-----------------------------|
| Capacity | 44Wh / 3900mAh | Often lower (e. g., 36Wh) |
| Cell Quality | Grade A+ cells | Unknown or recycled cells |
| Safety Protections | Overcharge, over-discharge, short circuit, over-temp | Basic or none |
| Warranty | 12 months | Usually 6 months or less |
| Compatibility | Full tested for listed models | May cause error messages |

**Installation Tips: **

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

2. Remove the back cover or battery compartment (depending on your model).

3. Gently disconnect the old battery cable and remove the battery.

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

5. Plug in the AC adapter and charge the battery fully before first use (about 4-6 hours).

6. For best battery life, avoid complete discharge; charge when the battery level drops to 20-30%.

**Note: **
- If your laptop does not recognize the new battery immediately, try
a hard reset: disconnect AC power, remove the battery, press and hold the power button for 30 seconds, then reinstall the battery and connect AC power.
- This battery is designed for original ASUS chargers. Using a non-certified charger may affect performance or safety.

**Package Includes: **
1 x Replacement Battery (B31N1336 / B31N1337 / B31N1338 compatible)
(English)

**Customer Support: **
If you have any questions about compatibility or installation, please contact us before purchasing. We are here to help!