Asus B21N1818 Laptop Battery for Asus VivoBook

Asus B21N1818 Laptop Battery for VivoBook X512, X509 & Compatible Models

If your Asus VivoBook battery is draining quickly, refusing to charge, shutting down unexpectedly, or no longer providing reliable backup, the Asus B21N1818 Laptop Battery is a compatible replacement option for supported VivoBook models. Designed around the B21N1818 battery family, it is available for a wide range of Asus VivoBook 14 and VivoBook 15 configurations.

The B21N1818 battery family is officially documented by ASUS for compatible notebook platforms. ASUS certification documents identify B21N1818-1 and B21N1818-2 as original battery-pack alternatives, with specifications including 7.6V and 4,050mAh for certain variants. ASUS also lists B21N1818 batteries through its official parts store for X509 and X512 notebook platforms.

For customers in Bangladesh, you can buy the Asus B21N1818 laptop battery from CARTX and choose the appropriate battery after checking the part number, connector and physical layout of the existing battery.

Asus B21N1818 Battery Specifications

Important: B21N1818 batteries exist in multiple variants. ASUS documentation shows different B21N1818 versions with different manufacturers and electrical specifications, so always match the part number and physical battery configuration before ordering.

Asus VivoBook B21N1818 Compatible Models

The B21N1818 battery family is associated with a broad range of ASUS VivoBook models. The compatibility list below follows the model information supplied for this product and available reference listings. Because battery variants can differ, customers should verify the exact battery part number before purchase.

VivoBook X512 Series

• Asus VivoBook 15 X512DA
• Asus VivoBook 15 X512DK
• Asus VivoBook 15 X512FA
• Asus VivoBook 15 X512FB
• Asus VivoBook 15 X512FJ
• Asus VivoBook 15 X512FL
• Asus VivoBook 15 X512UB
• Asus VivoBook 15 X512UF
• VivoBook 15 X512UB-EJ066

ASUS documentation specifically identifies X512-family notebook platforms and B21N1818-1/-2 battery alternatives.

VivoBook X509 Series

• Asus VivoBook 15 X509
• X509FA
• X509FB
• X509FJ
• X509FL
• X509JA
• X509JP
• X509JB
• X509UA
• X509UB
• X509UJ
• X509MA
• X509FA-EJ145T
• X509FA-EJ155T
• X509FJ-EJ145T
• X509JA-BQ040T
• X509JA-BQ084T
• X509JA-EJ027T
• X509JA-EJ114T
• X509JA-EJ129T-BE
• X509JB-BR055T
• X509MA-BR059T
• X509MA-BR060T
• X509UA-BR011T
• X509UA-BR036T
• X509UA-BR112T
• X509UA-EJ050T
• X509UB-EJ010T

ASUS’s official parts store lists B21N1818-2 and B21N1818-3 specifically for X509 battery assemblies.

VivoBook X409 / A409 Series

Compatible references include:

• VivoBook 14 F409UA
• VivoBook 14 X409FA-EK034T
• VivoBook 14 X409FA-EK070T
• VivoBook 14 X409UA-BV111T
• VivoBook 14 X409UA-EB053T
• VivoBook 14 X409UA-EK054T
• VivoBook 14 X409UA-EK341T
• VivoBook A409UA
• VivoBook A409UA-BV302T
• X409FL

ASUS’s certification documentation for the X409 platform identifies B21N1818 battery variants, including B21N1818-2, B21N1818-1 and B21N1818-3.

VivoBook F409 / F509 / A509 Series

Related models include:

• A509FA-EJ178T
• F409FA
• F409FB
• F509FB-EJ117T
• F509FJ
• F509MA
• F509MA-BR137T
• F509MA-BR299T
• VivoBook 15 F509FA-EJ014T
• VivoBook 15 F509FA-EJ255T
• VivoBook 15 F509FA-EJ672T
• VivoBook A509MA-BQ075
• VivoBook A509MA-BQ076T
• VivoBook A509UA-BQ255T
• VivoBook A509UA-EJ069T
• VivoBook D509BA-EJ052T

VivoBook M509 Series

• VivoBook 15 M509DA
• M509DA-BQ206
• M509DA-BR132T
• M509DA-BR139T
• M509DA-BR151
• M509DA-BR241
• M509DA-BR260
• M509DA-EJ034T
• M509DA-EJ102T
• M509DA-EJ333T
• M509DA-EJ641T
• M509DA-WB331

Other Listed Compatible Models

• FL8700FL
• Laptop 15 X509JA-BQ040T
• Laptop 15 X509UJ
• R427FJ
• R427FL
• R521FA-EJ111T
• VivoBook 15 X545FA-EJ116T
• VivoBook 15 X545FJ-BQ034T
• Y5200

Compatible Battery Part Numbers

Customers may search for this battery using different part numbers. The following identifiers are associated with the B21N1818 family:

• B21N1818
• B21BnEH
• 0B200-03190400
• 0B200-03190400E
• 2ICP6/61/80
• B31N1631
• C21N1335
• C21N1518
• A31N1302
• C31-X502C
• MP-12K13US-920W
• B31N1729
• C21N1625
• C31N1517
• A31N1537
• C21N1309
• B31N1635
• C31-X402
• C31-S551

Important compatibility note: these identifiers should not automatically be treated as interchangeable in every laptop. Battery shape, connector, mounting tabs, voltage and internal configuration can vary. Match the exact battery label and connector before purchasing.

Why Choose the Asus B21N1818 Laptop Battery?

A replacement laptop battery becomes useful when the original battery can no longer maintain adequate backup. A compatible B21N1818 battery can help restore portable use and reduce dependence on the laptop charger.

Key benefits include:

• Compatible with selected ASUS VivoBook laptops
• Lithium-ion battery technology
• Designed for internal laptop installation
• Suitable for replacing a weak or worn battery
• Multiple B21N1818 part-number references
• Available for selected VivoBook X512 and X509 platforms
• Convenient online purchase through CARTX
• Suitable for work, study and everyday laptop use

If you are comparing different laptop battery options in Bangladesh, always prioritize exact model and battery-part-number compatibility rather than choosing only by laptop series name.

When Should You Replace Your Asus VivoBook Battery?

Consider replacing your laptop battery if you notice:

• Battery backup has become significantly shorter
• Laptop shuts down suddenly when unplugged
• Battery percentage drops unusually fast
• Battery does not charge properly
• Laptop works only when connected to the charger
• Battery health has deteriorated significantly
• The battery is physically swollen or damaged

If the battery is swollen, stop using the laptop and have it inspected by a qualified technician. Do not puncture, bend or attempt to open a lithium-ion battery.

How to Check Whether B21N1818 Fits Your Laptop

Before ordering an Asus VivoBook battery, follow these steps:

1. Shut down your laptop safely.
2. Check the battery label or part number.
3. Look for B21N1818, B21BnEH or the relevant ASUS battery code.
4. Compare the voltage and capacity.
5. Check the connector position and shape.
6. Compare the mounting tabs and physical layout.
7. Confirm your exact laptop model.
8. If everything matches, order your laptop battery from CARTX.

This verification is especially important because ASUS documentation confirms that the B21N1818 family has multiple variants.

Asus B21N1818 Laptop Battery Price in Bangladesh

The price of the Asus B21N1818 laptop battery in Bangladesh can vary according to the battery variant, condition, brand/OEM status, warranty and availability.

For the latest CARTX price, availability and purchase information, check the product listing before placing your order.

Looking for a replacement battery? Shop laptop batteries from CARTX.

Buy Asus B21N1818 Laptop Battery from CARTX

CARTX provides an online destination for laptop batteries and other IT accessories in Bangladesh. The Asus B21N1818 laptop battery is suitable for customers who need a compatible replacement for selected ASUS VivoBook laptops.

Before ordering, send your exact laptop model or a clear photo of the existing battery label if you are unsure about compatibility. This helps reduce the risk of ordering the wrong battery variant.

Ready to replace your old battery? Buy the Asus B21N1818 laptop battery from CARTX.

Frequently Asked Questions

Is B21N1818 an original ASUS battery model?

Yes. B21N1818 is an ASUS-recognized battery family. ASUS’s own certification documents identify B21N1818-1 and B21N1818-2 as original battery-pack alternatives for relevant notebook platforms. ASUS also lists B21N1818 battery assemblies in its official parts store.

What voltage is the Asus B21N1818 battery?

The commonly documented B21N1818 variants include 7.6V versions. ASUS documentation lists B21N1818-1 and B21N1818-2 at 7.6V and 4,050mAh, while other B21N1818 variants have different electrical specifications.

How many cells does the B21N1818 battery have?

The configuration can vary by B21N1818 variant. For example, one ASUS-certified B21N1818 configuration is listed as a 2S1P battery pack, while commercial listings may describe particular versions differently. Always match the exact battery variant.

Which Asus VivoBook laptops use B21N1818?

B21N1818 is associated with selected ASUS VivoBook X512, X509, X409, F509, A509 and related notebook platforms. ASUS documentation confirms the battery family for X512 and X509/X409-related platforms.

Can I use any B21N1818 battery in my Asus laptop?

Not necessarily. B21N1818 has multiple variants, including B21N1818-1, B21N1818-2 and B21N1818-3. The connector, mounting tabs, voltage and physical layout can differ. Check the exact part number and battery design before purchasing.

Where can I buy an Asus B21N1818 battery in Bangladesh?

You can purchase the compatible Asus B21N1818 laptop battery from CARTX. Check the current product availability and verify your battery part number before ordering.

Does B21N1818 fit Asus VivoBook X512DA?

B21N1818 is listed for ASUS VivoBook 15 X512DA and other X512-series models. However, confirm the exact battery label, connector and variant before ordering.

Does B21N1818 fit Asus X509?

Yes, ASUS’s official parts store lists B21N1818-2 and B21N1818-3 battery assemblies for X509 platforms.

What should I do if my laptop battery is swollen?

Stop using the laptop and do not puncture, bend, open or attempt to repair the swollen lithium-ion battery. Have it safely removed and replaced by a qualified technician.

Final Buying Checklist

Before purchasing the Asus B21N1818 Laptop Battery, confirm:

• Exact ASUS laptop model
• Existing battery part number
• B21N1818 variant
• Voltage
• Capacity
• Connector
• Mounting-tab arrangement
• Battery dimensions
• Warranty offered by the seller

For a safer purchase, shop the CARTX Laptop Battery collection or contact CARTX with your laptop model and existing battery details.

Order your Asus B21N1818 Laptop Battery from CARTX today and replace your worn-out battery with the correct compatible solution.