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.

Asus VivoBook 14 X412FJ Series VivoBook 15 F512FA 15 X512DA Series Asus Y4100FA X412FJ A412FA Series C21N1818 [7.7V / 29Wh] Laptop Battery Replacement

C21N1818-3 Battery for Asus VivoBook 14 A409 A415 D409 D415 F409 F415 M409 M415 S415 X409 X415 Series Asus VivoBook 15 A509 A515 D509 D515 F509 F515 M509 M515 R565 S515 X509 X515 Series Laptop B21N1818-3 [7.7V] Compatible Battery

Q: Where can I find the battery part number?

Shut down the laptop, unplug power, remove the battery (if removable), and read the label printed on the battery itself. That part number is the best way to confirm compatibility.

Q: Are different battery voltages interchangeable?

No. You must match the voltage on your original battery. Note: 10.8V equals 11.1V, and 14.4V equals 14.8V.

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

You can use a laptop model number to narrow it down, but the battery part number is more precise. One laptop model can support multiple battery types, so the printed battery part number is best.

$55.00 CAD

~~$75.00 CAD~~ Vente $55.00 CAD

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

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Variantes de produits

Détails du produit

Type Laptop Battery
Unité de gestion de stock las350-db-001
Type de cellule Conventional Li-polymer

Description
Specification

COMPATIBLE LAPTOP MODELS

Asus VivoBook 14 A409 Series:

Asus VivoBook 14 A409DA Series

Asus VivoBook 14 A409M Series

Asus VivoBook 14 A409MA Series

Asus VivoBook 14 A409F Series

Asus VivoBook 14 A409FA Series

Asus VivoBook 14 A409FB Series

Asus VivoBook 14 A409FJ Series

Asus VivoBook 14 A409J Series

Asus VivoBook 14 A409JA Series

Asus VivoBook 14 A409JB Series

Asus VivoBook 14 A409JP Series

Asus VivoBook 14 A415 Series:

Asus VivoBook 14 A415E Series

Asus VivoBook 14 A415EA Series

Asus VivoBook 14 A415J Series

Asus VivoBook 14 A415JA Series

Asus VivoBook 14 A415D Series

Asus VivoBook 14 A415DA Series

Asus VivoBook 14 D409 Series:

Asus VivoBook 14 D409B Series

Asus VivoBook 14 D409BA Series

Asus VivoBook 14 D409D Series

Asus VivoBook 14 D409DA Series

Asus VivoBook 14 D409DJ Series

Asus VivoBook 14 D409DL Series

Asus VivoBook 14 D415 Series:

Asus VivoBook 14 D415D Series

Asus VivoBook 14 D415DA Series

Asus VivoBook 14 D415U Series

Asus VivoBook 14 D415UA Series

Asus VivoBook 14 F409 Series:

Asus VivoBook 14 F409DA Series

Asus VivoBook 14 F409J Series

Asus VivoBook 14 F409JA Series

Asus VivoBook 14 F409JB Series

Asus VivoBook 14 F409F Series

Asus VivoBook 14 F409FA Series

Asus VivoBook 14 F409FB Series

Asus VivoBook 14 F409FJ Series

Asus VivoBook 14 F409U Series

Asus VivoBook 14 F409UA Series

Asus VivoBook 14 F409UB Series

Asus VivoBook 14 F415 Series:

Asus VivoBook 14 F415E Series

Asus VivoBook 14 F415EA Series

Asus VivoBook 14 F415J Series

Asus VivoBook 14 F415JA Series

Asus VivoBook 14 F415M Series

Asus VivoBook 14 F415MA Series

Asus VivoBook 14 M409 Series:

Asus VivoBook 14 M409B Series

Asus VivoBook 14 M409BA Series

Asus VivoBook 14 M409D Series

Asus VivoBook 14 M409DA Series

Asus VivoBook 14 M409DJ Series

Asus VivoBook 14 M415 Series:

Asus VivoBook 14 M415D Series

Asus VivoBook 14 M415DA Series

Asus VivoBook 14 M415U Series

Asus VivoBook 14 M415UA Series

Asus VivoBook 14 S415 Series:

Asus VivoBook 14 S415D Series

Asus VivoBook 14 S415DA Series

Asus VivoBook 14 S415E Series

Asus VivoBook 14 S415EA Series

Asus VivoBook 14 S415J Series

Asus VivoBook 14 S415JA Series

Asus VivoBook 14 X409 Series:

Asus VivoBook 14 X409DA Series

Asus VivoBook 14 X409BA Series

Asus VivoBook 14 X409F Series

Asus VivoBook 14 X409FA Series

Asus VivoBook 14 X409FB Series

Asus VivoBook 14 X409FL Series

Asus VivoBook 14 X409FJ Series

Asus VivoBook 14 X409J Series

Asus VivoBook 14 X409JA Series

Asus VivoBook 14 X409JB Series

Asus VivoBook 14 X409JP Series

Asus VivoBook 14 X409M Series

Asus VivoBook 14 X409MA Series

Asus VivoBook 14 X415 Series:

Asus VivoBook 14 X415D Series

Asus VivoBook 14 X415DA Series

Asus VivoBook 14 X415DAP Series

Asus VivoBook 14 X415E Series

Asus VivoBook 14 X415EA Series

Asus VivoBook 14 X415EP Series

Asus VivoBook 14 X415F Series

Asus VivoBook 14 X415FA Series

Asus VivoBook 14 X415FAC Series

Asus VivoBook 14 X415J Series

Asus VivoBook 14 X415JA Series

Asus VivoBook 14 X415JAB Series

Asus VivoBook 14 X415JP Series

Asus VivoBook 14 X415M Series

Asus VivoBook 14 X415MA Series

Asus VivoBook 15 A509 Series:

Asus VivoBook 15 A509DA Series

Asus VivoBook 15 A509M Series

Asus VivoBook 15 A509MA Series

Asus VivoBook 15 A509F Series

Asus VivoBook 15 A509FA Series

Asus VivoBook 15 A509FB Series

Asus VivoBook 15 A509FJ Series

Asus VivoBook 15 A509J Series

Asus VivoBook 15 A509JA Series

Asus VivoBook 15 A509JB Series

Asus VivoBook 15 A509JP Series

Asus VivoBook 15 A515 Series:

Asus VivoBook 15 A515D Series

Asus VivoBook 15 A515DA Series

Asus VivoBook 15 A515E Series

Asus VivoBook 15 A515EA Series

Asus VivoBook 15 A515EP Series

Asus VivoBook 15 A515J Series

Asus VivoBook 15 A515JA Series

Asus VivoBook 15 D509 Series:

Asus VivoBook 15 D509B Series

Asus VivoBook 15 D509BA Series

Asus VivoBook 15 D509D Series

Asus VivoBook 15 D509DA Series

Asus VivoBook 15 D509DJ Series

Asus VivoBook 15 D509DL Series

Asus VivoBook 15 D515 Series:

Asus VivoBook 15 D515D Series

Asus VivoBook 15 D515DA Series

Asus VivoBook 15 D515U Series

Asus VivoBook 15 D515UA Series

Asus VivoBook 15 F509 Series:

Asus VivoBook 15 F509DA Series

Asus VivoBook 15 F509J Series

Asus VivoBook 15 F509JA Series

Asus VivoBook 15 F509JB Series

Asus VivoBook 15 F509F Series

Asus VivoBook 15 F509FA Series

Asus VivoBook 15 F509FB Series

Asus VivoBook 15 F509FJ Series

Asus VivoBook 15 F509U Series

Asus VivoBook 15 F509UA Series

Asus VivoBook 15 F509UB Series

Asus VivoBook 15 F515 Series:

Asus VivoBook 15 F515E Series

Asus VivoBook 15 F515EA Series

Asus VivoBook 15 F515J Series

Asus VivoBook 15 F515JA Series

Asus VivoBook 15 F515M Series

Asus VivoBook 15 F515MA Series

Asus VivoBook 15 M509 Series:

Asus VivoBook 15 M509B Series

Asus VivoBook 15 M509BA Series

Asus VivoBook 15 M509D Series

Asus VivoBook 15 M509DA Series

Asus VivoBook 15 M509DJ Series

Asus VivoBook 15 M515 Series:

Asus VivoBook 15 M515D Series

Asus VivoBook 15 M515DA Series

Asus VivoBook 15 M515U Series

Asus VivoBook 15 M515UA Series

Asus VivoBook 15 R565 Series:

Asus VivoBook 15 R565E Series

Asus VivoBook 15 R565EA Series

Asus VivoBook 15 R565EP Series

Asus VivoBook 15 R565J Series

Asus VivoBook 15 R565JA Series

Asus VivoBook 15 R565JF Series

Asus VivoBook 15 R565JP Series

Asus VivoBook 15 R565F Series

Asus VivoBook 15 R565FA Series

Asus VivoBook 15 R565M Series

Asus VivoBook 15 R565MA Series

Asus VivoBook 15 S515 Series:

Asus VivoBook 15 S515D Series

Asus VivoBook 15 S515DA Series

Asus VivoBook 15 S515E Series

Asus VivoBook 15 S515EA Series

Asus VivoBook 15 S515J Series

Asus VivoBook 15 S515JA Series

Asus VivoBook 15 X509 Series:

Asus VivoBook 15 X509DA Series

Asus VivoBook 15 X509BA Series

Asus VivoBook 15 X509F Series

Asus VivoBook 15 X509FA Series

Asus VivoBook 15 X509FB Series

Asus VivoBook 15 X509FJ Series

Asus VivoBook 15 X509FL Series

Asus VivoBook 15 X509J Series

Asus VivoBook 15 X509JA Series

Asus VivoBook 15 X509JB Series

Asus VivoBook 15 X509JP Series

Asus VivoBook 15 X509M Series

Asus VivoBook 15 X509MA Series

Asus VivoBook 15 X515 Series:

Asus VivoBook 15 X515D Series

Asus VivoBook 15 X515DA Series

Asus VivoBook 15 X515DAP Series

Asus VivoBook 15 X515E Series

Asus VivoBook 15 X515EA Series

Asus VivoBook 15 X515EP Series

Asus VivoBook 15 X515F Series

Asus VivoBook 15 X515FA Series

Asus VivoBook 15 X515FAC Series

Asus VivoBook 15 X515J Series

Asus VivoBook 15 X515JA Series

Asus VivoBook 15 X515JAB Series

Asus VivoBook 15 X515JP Series

Asus VivoBook 15 X515M Series

Asus VivoBook 15 X515MA Series

COMPATIBLE ORIGINAL PART NUMBERS

B21N1818-3 | C21N1818-3

REMARKS
- This battery is NOT compatible with OPN: C21N1818-1 and C21N1818-2. 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.
Product Type: Replacement Laptop Battery

Condition: New

Cell Type: Conventional Li-polymer

Capacity: 3800mAh / 29Wh

Device Voltage: 7.7V

Product Type:	Replacement Laptop Battery
Condition:	New
Cell Type:	Conventional Li-polymer
Capacity:	3800mAh / 29Wh
Device Voltage:	7.7V

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.