Product Overview
The B31N1336 (also sold as C31-S551) is a Grade-A 3-cell 48Wh / 4400mAh Li-ion replacement battery at 11.4V for ASUS VivoBook S551, S551LB, S551LA, R553L, R553LN, R553LF, K551LN, V551 and V551LA series laptops. Flex-3 certified for precise capacity reporting and protection-circuit compliance with accurate charge-state communication to the OS. Ships 100% brand new with a 1-year warranty.
Specifications
| Attribute | Details |
|---|---|
| Standard Model | B31N1336 |
| Capacity | 48Wh / 4400mAh |
| Voltage | 11.4V |
| Battery Type | Li-ion (3 Cells) |
| Cell Grade | Grade-A |
| Flex-3 Compatible | Yes |
| Condition | 100% Brand New Replacement Battery |
| Warranty | 1-Year Warranty |
Replace Part Numbers
- B31N1336
- C31-S551
Compatible Models
- For ASUS VivoBook S551 Series
- For ASUS VivoBook S551LB
- For ASUS VivoBook S551LA
- For ASUS R553L Series
- For ASUS R553LN
- For ASUS R553LF
- For ASUS K551LN
- For ASUS V551 Series
- For ASUS V551LA
FAQ
What is the difference between B31N1336 and C31-S551?
B31N1336 and C31-S551 are two part numbers for the same battery. Both refer to the identical 11.4V 48Wh 3-cell Li-ion battery used in the ASUS VivoBook S551 and R553L series, and this replacement fits both.
Is the B31N1336 battery brand new?
Yes — it is 100% brand new with Grade-A Li-ion cells and Flex-3 certified protection for safe, accurate charging.
What warranty is provided?
A 1-year warranty against manufacturing defects is included, with full customer support from the date of purchase.
Note:
This is not a complete list or inclusion of all compatible laptop models. You can open the back of your laptop to check the original battery model. If you have any compatibility questions, please contact us online.High Quality Garanteed
Our battery products are manufactured using high-quality materials and advanced technology to ensure stability and reliability.
The casing is made of durable materials, the mainboard adopts advanced technology, and the battery core is produced with high-quality raw materials to ensure that it will not be damaged after long-term use.
Our products are equipped with multiple protection technologies such as overvoltage, overcurrent, and overcharge to effectively protect the safety of batteries and equipment.
The casing is made of durable materials, the mainboard adopts advanced technology, and the battery core is produced with high-quality raw materials to ensure that it will not be damaged after long-term use.
Our products are equipped with multiple protection technologies such as overvoltage, overcurrent, and overcharge to effectively protect the safety of batteries and equipment.
China warehouse delivery method
Shipping Methods
Ship To
Est. Delivery Time
Shipping Cost
Taxes & Fees
USPS
United States(No AK/HI, PR/GU, PO Boxes, or APO/FPO)
10-15 business days
Free
Free
Canada Post
Canada
10-15 business days
Free
Free
Royal Mail / Yodel
United Kingdom
15-20 business days
Free
Free
Local Carriers
Germany/Netherlands/Norway
15-20 business days
Free
Free
La Poste
France
15-20 business days
Free
Free
Local Carriers
Australia/New Zealand
15-20 business days
Free
Free
Correios
Mexico/Spain/IT
15-25 business days
Free
Free
Local Carriers
SE Asia / East Asia
5-10 business days
Free
Free
Local Carriers
Rest of Europe
20-25 business days
From $5.99
Free
Local Carriers
UAE / Saudi Arabia / Israel
16-20 business days
From $7.99
Free
Overseas Warehouse Shipping Times & Costs
Shipping Methods
Ship To
Est. Delivery
Shipping Cost
Taxes & Fees
US Warehouse
United States
3-7 business days
Free
Free
European Warehouse
EU countries
5-7 business days
€0 – €5.99
pricing varies by country
Free
UK Warehouse
United Kingdom
3-7 business days
Free
Free
Canada Warehouse
Canada
5-7 business days
Free
Free
Payment Methods
Paypal
Payments by PayPal, no PayPal account required. Paypal is safe and free for buyers.
PayPal account: Payment@batterymall.com
Account Name: ShenZhen KingSener Science and Technology Co., Ltd
Credit or debit card
VISA, MasterCard, the United States n Express,Maestro & Laser Card, APPLE Pay,etc.
PayPal never shares your financial information with us.
WeChat Pay
Currently only supports QR code payment. Please contact WeChat customer service and go to WeChat App to scan the QR code to complete the payment.
Google Pay
Pay with Google Pay, which is more convenient and faster.
Apple Pay
If you use an Apple device, you can use Apple Pay to pay, which is more convenient and faster.
Bank Transfer
If you cannot use the above payment methods and the order amount exceeds HK$2000, please contact our customer service to obtain your bank account and pay via bank transfer.
Q&A
Quick FAQ:Laptop Battery Care & Troubleshooting
- How long does a KingSener battery last?2 to 3 years (approx. 500-800 charge cycles) under normal temperatures.
- Laptop says "Battery Not Detected". How to fix?1. Hard Reset: Unplug AC, remove battery, hold power button for 30 seconds.
2. Clean Contacts: Wipe metal connection pins.
3. Reset Drivers: Uninstall battery drivers in Device Manager, then restart.
4. Update BIOS: Ensure motherboard firmware is up to date. - Can I leave my laptop plugged in 24/7?Yes, the built-in TI chip prevents overcharging. Tip: To prevent long-term cell swelling, unplug and drain the battery to 40% twice a month.
- How do I store a laptop battery long-term?Store it at 50% charge in a cool, dry place. Never store at 0% or 100%. Cycle the battery every 3 months to maintain chemical activity.
-
Are KingSener batteries safe?Yes. All batteries feature built-in IC protection against short-circuits, over-voltage, and overheating. Fully CE, FCC, and RoHS certified.