What quick settings can extend laptop battery life?

Enable Battery Saver/Power Saver, reduce screen brightness, close unused apps/tabs, turn off Wi-Fi/Bluetooth when not needed, and avoid heat buildup by keeping vents clear.

Will this battery work with my Asus C21N1818-2?

If your laptop is a Asus C21N1818-2, this battery is intended to be compatible. Please also compare your original battery’s part number and voltage with the product details on this page to confirm before ordering.

Is this battery compatible with the C21N1818-2?

Yes. This battery is designed for the Asus C21N1818-2 and other compatible laptop models listed on the product page. Confirm your exact model before purchase.

What does 3800mAh / 29Wh mean for battery life?

The capacity (3800mAh / 29Wh) indicates how much energy the battery can store. Higher capacity typically means longer runtime, but actual battery life depends on your laptop settings and usage.

What kind of cells are inside this laptop battery?

This battery uses Conventional Li-polymer cells, commonly used in laptop batteries for stable power delivery and reliability.

Is this an original Asus battery?

This is a high-quality replacement battery built to meet the required specifications for Asus laptops such as the C21N1818-2.

Asus VivoBook 15 X509 X515 X509DA X509BA X509F X509FA X509FB X509J X509JA X509JB X509JP X509M X509MA X515D X515DA X515E X515EA X515EP X515F X515FA X515J X515JA X515M X515MA Series Laptop Battery C21N1818-3 B21N1818-3 [7.7V] Compatible Battery

C21N1818-2 Battery for Asus VivoBook 14 A412 F412 R424D X412 Asus VivoBook 15 F512 R564 X512 Asus VivoBook S14 S412 Asus VivoBook Y4200 Y5200F Asus VivoBook X409 X509 X545 Series Laptop B21N1818-2 [7.7V] Compatible Battery

$55.00 CAD

~~$75.00 CAD~~ Sale $55.00 CAD

Minimum Qty	Discount
Buy 5 +	Price with 10% off: $49.50
Buy 10 +	Price with 20% off: $44.00

Discount will be applied at Checkout page

Product variants

Product Info

Type Laptop Battery
SKU las350-db-001
Compatible Brand Asus
Capacity 3800mAh / 29Wh
Cell Type Conventional Li-polymer
Shipping Free Shipping

COMPATIBLE LAPTOP MODELS

Asus VivoBook 14 A412 Series:

Asus VivoBook 14 A412D Series

Asus VivoBook 14 A412DA Series

Asus VivoBook 14 A412DK Series

Asus VivoBook 14 A412F Series

Asus VivoBook 14 A412FA Series

Asus VivoBook 14 A412FL Series

Asus VivoBook 14 A412FJ Series

Asus VivoBook 14 A412U Series

Asus VivoBook 14 A412UA Series

Asus VivoBook 14 F412 Series:

Asus VivoBook 14 F412D Series

Asus VivoBook 14 F412DA Series

Asus VivoBook 14 F412DK Series

Asus VivoBook 14 F412F Series

Asus VivoBook 14 F412FA Series

Asus VivoBook 14 F412FL Series

Asus VivoBook 14 F412FJ Series

Asus VivoBook 14 F412U Series

Asus VivoBook 14 F412UA Series

Asus VivoBook 14 R424 Series:

Asus VivoBook 14 R424D Series

Asus VivoBook 14 R424DA Series

Asus VivoBook 14 R424F Series

Asus VivoBook 14 R424FA Series

Asus VivoBook 14 X412 Series:

Asus VivoBook 14 X412D Series

Asus VivoBook 14 X412DA Series

Asus VivoBook 14 X412DK Series

Asus VivoBook 14 X412F Series

Asus VivoBook 14 X412FA Series

Asus VivoBook 14 X412FJ Series

Asus VivoBook 14 X412FL Series

Asus VivoBook 14 X412U Series

Asus VivoBook 14 X412UA Series

Asus VivoBook 14 X412UB Series

Asus VivoBook 14 X412UF Series

Asus VivoBook 14 X412J Series

Asus VivoBook 14 X412JA Series

Asus VivoBook 15 F512 Series:

Asus VivoBook 15 F512FA Series

Asus VivoBook 15 F512UA Series

Asus VivoBook 15 F512UB Series

Asus VivoBook 15 R564 Series

Asus VivoBook 15 X512 Series:

Asus VivoBook 15 X512DA Series

Asus VivoBook 15 X512DK Series

Asus VivoBook 15 X512FA Series

Asus VivoBook 15 X512FB Series

Asus VivoBook 15 X512FJ Series

Asus VivoBook 15 X512FL Series

Asus VivoBook S14 S412 Series:

Asus VivoBook S14 S412 Series

Asus VivoBook S14 S412F Series

Asus VivoBook S14 S412FA Series

Asus VivoBook S14 S412FJ Series

Asus VivoBook S14 S412FL Series

Asus VivoBook S14 S412D Series

Asus VivoBook S14 S412DA Series

Asus VivoBook S14 S412DK Series

Asus VivoBook S14 S412U Series

Asus VivoBook S14 S412UA Series

Asus VivoBook Y4200 Series

Asus VivoBook Y5200F Series

Asus VivoBook X409 Series:

Asus VivoBook X409BA Series

Asus VivoBook X409DA Series

Asus VivoBook X409DJ Series

Asus VivoBook X409DL Series

Asus VivoBook X409FA Series

Asus VivoBook X509 Series:

Asus VivoBook X509DA Series

Asus VivoBook X509DJ Series

Asus VivoBook X509DL Series

Asus VivoBook X509FA Series

Asus VivoBook X545 Series:

Asus VivoBook X545FA Series

COMPATIBLE ORIGINAL PART NUMBERS

B21N1818-2 | C21N1818-2 | 0B200-03450000

REMARKS

There are 2 types of batteries for the same laptop model, please check the part number and shape of the battery before placing the order.

Compatible Brand: Asus

🔋 See More Asus Compatible Laptop Batteries ⚡ See More Asus Compatible Laptop Adapters

Laptop Battery FAQs How To Find The Correct Battery?

How do I know if a laptop battery will fit my device?

The most reliable method is matching the part number printed on your original battery. Also confirm the voltage and compare the battery shape and connector position with the product photos and specifications.

Where can I find the battery part number?

Shut down the laptop, unplug the power adapter, remove the battery if it is removable, and read the label printed directly on the battery. This part number is the best way to confirm compatibility.

Are different battery voltages interchangeable?

No. You must match the voltage shown on your original battery. Note that 10.8V equals 11.1V, and 14.4V equals 14.8V, but other voltage differences are not compatible.

What should I compare before ordering a replacement battery online?

Compare the original battery’s part number and voltage first, then check the size and shape, connector type and location, latch position, and orientation against the product photos and specifications.

Can I use my laptop model number instead of the battery part number?

You can use the laptop model number to narrow down options, but the battery part number is more precise. A single laptop model can support multiple battery types, so matching the printed battery part number is best.

What quick settings can help extend laptop battery life?

Enable Battery Saver or Power Saver mode, reduce screen brightness, close unused apps and browser tabs, turn off Wi-Fi or Bluetooth when not needed, and avoid heat by keeping the laptop vents clear.

Choosing the correct replacement battery or adapter is critical for safety, performance, and compatibility. DrBattery.com carries over 120,000 compatible models and part numbers for major laptop brands. Follow these steps before placing your order:

1. Check Your Device Information

Look at your device’s owner’s manual or label on the bottom of your laptop. Both should show the brand and exact model number.
If you are buying an adapter, confirm the model number, input voltage, and current listed on your device label.

2. Verify the Original Battery Part Number

Always shut down your laptop before removing the original battery. On the battery label, you will find a part number. This part number is the most reliable way to ensure compatibility.

3. Recognize Common Part Number Formats

Major manufacturers use standard codes. Here are some examples:

HP / Compaq:
123456-001

Sony:
PCGA-BP12, VGP-BP1

Dell:
312-1234, 1234P

IBM / Lenovo:
02K1234, 08K1234

Toshiba:
PA1234U-1BRS

4. Compare the Physical Details

Check the size, connector type, latch position, and orientation of your original battery. Compare these details with the product photos on our website before ordering.

5. Watch Out for Voltage Differences

Some models have two different voltage options — for example, 11.1V vs. 14.8V. They are NOT interchangeable. Always confirm the voltage printed on your original battery.