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 B21N1329?

If your laptop is a Asus B21N1329, 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 B21N1329?

Yes. This battery is designed for the Asus B21N1329 and other compatible laptop models listed on the product page. Confirm your exact model before purchase.

What does 4000mAh / 29Wh mean for battery life?

The capacity (4000mAh / 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 B21N1329.

Asus X553 X453 X453MA R515MA D553MA-HH01 D553MA X553MA-SX457B X553MA-DB01 B21N1329 0B200-00840000 [7.2V / 29Wh] Laptop Battery Replacement

B21N1329 Battery for Asus X553MA X553M X553 X503M X502CA X453MA X453 X403MA X403M R515MA R515M R413MA R413M F553MA F553M F553 F453MA F453M D553MA D453M Series Laptop 0B200-00840000 [7.2V] Compatible Battery

$39.00 USD

~~$65.00 USD~~ Sale $39.00 USD

Minimum Qty	Discount
Buy 5 +	Price with 10% off: $35.10
Buy 10 +	Price with 20% off: $31.20

Discount will be applied at Checkout page

Product variants

Please check before ordering

Some laptop models may use different battery versions. Before purchasing, please compare your original battery’s shape, connector location and mounting points with the product photos. Also check the battery label and confirm that its Model or OPN number matches one listed on the product page.

Product Info

Type Laptop Battery
SKU las256-db-001
Compatible Brand Asus
Capacity 4000mAh / 29Wh
Cell Type Conventional Li-polymer
Shipping Free Shipping

COMPATIBLE LAPTOP MODELS

Asus D453M Series

Asus D553MA Series

Asus F453M Series

Asus F453MA Series

Asus F553 Series

Asus F553M Series

Asus F553MA Series

Asus R413M Series

Asus R413MA Series

Asus R515M Series

Asus R515MA Series

Asus X403M Series

Asus X403MA Series

Asus X453 Series

Asus X453MA Series

Asus X502CA Series

Asus X503M Series

Asus X553 Series

Asus X553M Series

Asus X553MA Series

COMPATIBLE ORIGINAL PART NUMBERS

B21N1329 | 0B200-00840000

REMARKS

Please confirm your laptop model and battery number before placing an order.

Compatible Brand: Asus

⚡ See More Asus Compatible Laptop Adapters

Laptop Battery FAQs How To Find The Correct Battery?

🔋 How do I calibrate my newly installed battery?

Charge it to 100% and keep it plugged in for two more hours. Then use your device until it shuts off due to low battery, and recharge it uninterrupted to 100%. If it cannot reach 100%, check for a smart-charging or charge-limit setting. If the battery reading seems inaccurate, drain it to 5% or lower and recharge it uninterrupted. If the problem continues, contact support.

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.