# Battery ASUS NB431021 E402

**URL:** https://aio.lv/en/product--asus-nb431021--4113301
**Data updated:** 2025-12-29 15:39 (EET)
**Category:** Portable Device Batteries
**Manufacturer:** Asus
**Manufacturer code:** NB431021
**EAN:** 9990000431021
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 61.99 €
**Prices and availability valid until:** 2026-08-07 23:59
**Price without VAT (21%):** 51.23 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--asus-nb431021--4113301

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

The ASUS NB431021 battery is designed for the ASUS E402 laptop. It offers reliable performance and long-lasting power, ensuring your device runs smoothly. With high-quality cells, this battery provides excellent durability and safety features. Easy to install, it is a perfect replacement for your old battery, enhancing your laptop's efficiency and portability.

## Long description

The ASUS NB431021 E402 battery is a replacement battery specifically designed for the ASUS E402 laptop. It provides reliable performance and long-lasting power with high-quality cells and built-in safety features. The battery is easy to install and restores mobility and runtime to your device.
Advantages
This ASUS NB431021 battery offers stable power delivery and durability thanks to quality cells and protective circuitry. It is compatible with the ASUS E402 model, has a 4200 mAh capacity for extended use between charges, and is designed for straightforward installation without special tools.
Suitable for
Replacing a worn or failing battery in an ASUS E402 laptop
Extending mobile runtime for travel or remote work
Maintaining laptop portability when the original battery no longer holds charge
Key specifications
Brand: Asus
Model/MPN: NB431021
Compatible model: ASUS E402
Capacity: 4200 mAh
EAN: 9990000431021
Category: Batteries for portable devices
How to use
Shut down the laptop and disconnect any external power source. Remove the laptop's back cover or battery compartment cover according to the ASUS E402 service instructions, then remove the old battery and install the ASUS NB431021 in the correct orientation until it clicks or secures. Reassemble the cover, reconnect power, and turn on the laptop. Allow the new battery to charge fully before first use for optimal battery calibration.
Usage recommendations
Use only genuine or compatible replacements that match the ASUS E402 specifications. Avoid exposing the battery to high temperatures, moisture, or impact. Charge and discharge the battery periodically and follow manufacturer safety guidance for storage and disposal.

## Specifications

### Battery

| Feature | Value |
|---|---|
| Battery capacity | 4200 mAh |
| Battery capacity | 32 Wh |

### Technical details

| Feature | Value |
|---|---|
| Type | Battery |
| Compatibility | E402 |
| Brand compatibility | ASUS |

## FAQ

### How much does the Battery ASUS NB431021 E402 cost, and is it available for purchase?

The price is 61.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 15.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Asus products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Asus service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: battery capacity, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/4113301/65717500_large.webp