# Replacement Battery B21N1818-3 for ASUS VivoBook 14 X409 / 15 X509

32Wh · 7.6V · 2-Cell Li-polymer · 6 Months Warranty

- Price: NPR 4,500 (offer; regular price NPR 5,000, you save NPR 500, 10% off)
- Availability: In stock, only 5 left
- Brand: [ASUS](https://proudnepal.com.np/brands/asus)
- Category: Battery
- Warranty: 6 months proud nepal warranty
- Part number: B21N1818-3
- In the box: 1 x Battery
- Last updated 11 Oct 2026

## Key specifications

- Product Type: Laptop Battery
- Capacity mAh: 4212mAh
- Capacity Wh: 32Wh
- Nominal Voltage: 7.6V
- Cell Count: 2 Cells
- Chemistry: Li-polymer

## Description

Replacement battery B21N1818-3 for ASUS VivoBook 14 X409 / 15 X509. It fits ASUS VivoBook 14 X409FB, X409FL, X409JB, X409UJ and VivoBook 15 F509UA, X509DA, X509FB, X509MA, X509UA, X509UJ; B21N1818 comes in several shapes, so check the code and shape of your old battery. Also sold as B21N1818. Check the code printed on your old battery before ordering. 6 Months shop warranty from Proud Nepal IT Suppliers.

- Product Type: Laptop Battery
- Model: B21N1818-3
- Compatible Laptop Models: ASUS VivoBook 14 X409FB, X409FL, X409JB, X409UJ and VivoBook 15 F509UA, X509DA, X509FB, X509MA, X509UA, X509UJ; B21N1818 comes in several shapes, so check the code and shape of your old battery
- Compatible Battery Part Numbers: B21N1818
- Chemistry: Li-polymer
- Nominal Voltage: 7.6V
- Capacity mAh: 4212mAh
- Capacity Wh: 32Wh
- Cell Count: 2 Cells
- Internal / External: Internal

## Delivery, warranty and returns

- Delivery: free all over Nepal, usually the same day inside Kathmandu Valley, 2 to 3 days elsewhere in Nepal, sent with Nepal Can Move.
- Refunds: We don't offer refunds. Faulty products are repaired or replaced under warranty. https://proudnepal.com.np/policies/returns
- Warranty policy: https://proudnepal.com.np/policies/warranty
- Prices are in Nepali rupees (NPR).

## Contact

- Proud Nepal IT Suppliers Pvt. Ltd., Putalisadak, Kathmandu, Nepal
- Phone and WhatsApp: +977 9867174242
- Email: proudnepalits@gmail.com

Product page: https://proudnepal.com.np/products/replacement-battery-b21n1818-3-for-asus-vivobook-14-x409-15-x509-7da059