Notice:
1. Please review the details below before ordering.
2. You can use "Ctrl+F" to find your own model or part number.

3. Check your original battery model. It's best to compare your original battery with ours. 
    Picking a battery only by laptop model can result in buying the wrong one.

What should I do if this battery is not recognized or cannot be charged?
After installing the battery, charge it for 5-8 hours.
A. First, verify whether the battery is the correct one.
B. Next, check if the battery is properly installed. Please make sure that the connector of the battery has been inserted into the system board correctly and tightly
C. It is recommended to update the BIOS settings
D. Reinstall and see(if it works)
Feel free to reach out to us for support.

Shipping information:
We usually dispatch your package within 48 hours after payment is received. The estimated shipping time is 10-23 business days.

Important Shipping Information:
- Batteries purchased through this link will be shipped from China
- Packages require international transit and customs clearance
- These procedures significantly extend delivery times
- We do not recommend purchasing if you need the item quickly

What to Do If Your Package Is Delayed?
We're unable to track every individual package's delivery status. If:  
✓ Your package hasn't arrived by the estimated date  
✓ Tracking hasn't updated for a long time  
Please contact our customer service - we'll investigate and respond within 48 hours.


Order Confirmation Notice: 
After placing your order, please double-check:  
✓ **Shipping address** (complete and accurate)  
✓ **Phone number** (active and correct)  

For successful delivery to Canada, please ensure:  
**Recipient Name Must:**  
✅ Include full first name and last name

Customer Service:
**Working Hours: Monday to Friday, 9:00 AM to 6:00 PM (China Standard Time, CST)
**Due to time zone differences, we may not be able to reply to your message immediately.
   Customer service typically responds within 24 hours.

Specification
Brand New
Source factory
With tools
The battery will undergo testing before being sent out.
Battery Type: Li-ion
Voltage: 7.7V
Capacity: 37Wh

Compatible With Models:

Replacement for Asus VivoBook 14 D409 D409B D409BA D409D D409DA D409DJ D409DL Series;

Replacement for Asus VivoBook 14 M409 M409B M409BA M409D M409DA M409DJ Series;

Replacement for Asus VivoBook 14 F409 F409DA F409J F409JA F409JB F409F F409FA F409FB F409FJ F409U F409UA F409UB Series;

Replacement for Asus VivoBook 14 A409 A409DA A409M A409MA A409F A409FA A409FB A409FJ A409J A409JA A409JB A409JP Series;

Replacement for Asus VivoBook 14 X409 X409DA X409BA X409F X409FA X409FB X409FL X409FJ X409J X409JA X409JB X409JP X409M X409MA Series;

Replacement for Asus VivoBook 15 D509 D509B D509BA D509D D509DA D509DJ D509DL Series;

Replacement for Asus VivoBook 15 M509 M509B M509BA M509D M509DA M509DJ Series;

Replacement for Asus VivoBook 15 F509 F509DA F509J F509JA F509JB F509F F509FA F509FB F509FJ F509U F509UA F509UB Series;

Replacement for Asus VivoBook 15 A509 A509DA A509M A509MA A509F A509FA A509FB A509FJ A509J A509JA A509JB A509JP Series;

Replacement for Asus VivoBook 15 X509 X509DA X509BA X509F X509FA X509FB X509FJ X509FL X509J X509JA X509JB X509JP X509M X509MA Series;

Replacement for Asus VivoBook 14 X415 X415D X415DA X415DAP X415E X415EA X415EP X415F X415FA X415FAC X415J X415JA X415JAB X415JP X415M X415MA Series;

Replacement for Asus VivoBook 14 D415 D415D D415DA D415U D415UA Series;

Replacement for Asus VivoBook 14 M415 M415D M415DA M415U M415UA Series;

Replacement for Asus Vivobook 14 F415 F415E F415EA F415J F415JA F415M F415MA Series;

Replacement for Asus VivoBook 14 A415 A415E A415EA A415J A415JA A415D A415DA Series;

Replacement for Asus VivoBook 14 S415 S415E S415EA S415J S415JA S415D S415DA Series;

Replacement for Asus VivoBook 15 D515 D515D D515DA D515U D515UA Series;

Replacement for Asus VivoBook 15 M515 M515D M515DA M515U M515UA Series;

Replacement for Asus VivoBook 15 F515 F515E F515EA F515J F515JA F515M F515MA Series;

Replacement for Asus VivoBook 15 A515 A515E A515EA A515EP A515J A515JA A515D A515DA Series;

Replacement for Asus VivoBook 15 S515 S515E S515EA S515J S515JA S515D S515DA Series;

Replacement for Asus VivoBook 15 X515 X515D X515DA X515DAP X515E X515EA X515EP X515F X515FA X515FAC X515J X515JA X515JAB X515JP X515M X515MA Series;

Replacement for Asus VivoBook 15 R565 R565E R565EA R565EP R565J R565JA R565JF R565JP R565F R565FA R565M R565MA Series.


Compatible Part Numbers:
B21N1818-3 C21N1818-3

Note: For more accrate, please check the part number of your original battery.


Safety:
UL/CE-/FCC-/RoHS certified

Overload protection

Over-current protection

Over-voltage protection

High voltage protection

Short circuit protection

Over-temperature protection