Product Overview
The C31N1821 is a premium OEM-grade replacement battery built for the ASUS ZenBook S13 UX392 series ultrabook, restoring a dependable 50Wh (4335mAh) of power at 11.55V so you can keep working, streaming and creating all day without hunting for a power outlet. Engineered as a direct drop-in match for the original ASUS battery, it ends random shutdowns, rapid drain and charging failures.
Each battery is assembled from high-quality Li-ion cells with an intelligent Battery Management System (BMS) for overcharge, over-discharge, over-current and short-circuit protection, passes strict pre-shipment quality checks, and is backed by a 1-year warranty. Please note: this C31N1821 interface is on the right, not on the left - please confirm this detail clearly when placing your order.
Specifications
| Standard Model | C31N1821 |
| Battery Type | Li-ion |
| Voltage | 11.55V |
| Capacity | 50Wh / 4335mAh |
| Color | Black |
| Condition | Replacement Battery (100% Brand New, 1-year warranty!) |
| Warranty | 1-Year Warranty |
Replace Part Numbers
- C31N1821
- 0B200-03210100
Compatible Models
Fits the following ASUS ZenBook S13 models (always confirm the battery model printed on your original battery before ordering):
- For ASUS ZenBook S13 UX392 Series
- For ASUS ZenBook UX392F
- For ASUS ZenBook S13 UX392FA-AB004T
- For ASUS ZenBook S13 UX392FA-AB017T
- For ASUS ZenBook S13 UX392FN-XS71
- For ASUS ZenBook S13 UX392FN-0042B8265U
FAQ
Will the C31N1821 battery fit my ASUS ZenBook S13 laptop?
This C31N1821 battery fits the ASUS ZenBook S13 UX392 series, including UX392F, UX392FA and UX392FN models such as UX392FA-AB004T, UX392FA-AB017T, UX392FN-XS71 and UX392FN-0042B8265U. Before ordering, please confirm the model printed on your original battery label matches C31N1821.
What capacity and voltage does this battery provide?
The battery delivers 50Wh / 4335mAh at 11.55V, matching the original OEM specification (replacing part number 0B200-03210100) to restore the full runtime your ZenBook S13 had when new.
Which side is the connector on for this C31N1821 battery?
Please note: this C31N1821 interface is on the right, not on the left. Please confirm this detail clearly when placing your order so you receive the correct orientation.
Is the battery safe and covered by a warranty?
Yes. It is 100% brand new with a built-in BMS providing overcharge, over-discharge, over-current and short-circuit protection, is CE-compliant, and is covered by a 1-year warranty with reliable after-sales support.
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.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.
Shipping Methods
| Shipping Methods | Ship To | Est. Delivery Time | Shipping Cost | Taxes & Fees |
|---|---|---|---|---|
| USPS / DHL | United States | 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 |
| DHL | Germany | 15-20 business days | Free | Free |
| La Poste | France | 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 |
📦 Shipping & Tracking Information
Looking for faster shipping? We offer local warehousing services. Please visit our "Local Delivery" page for items available for immediate dispatch.
1. How to Track Your Package:
Please choose the tracking link that corresponds to your destination:
- Europe & The Americas: 17track.net/en
- The Middle East: mena56.com
- Asia: 17exp.kingtrans.cn
Need Help?
If you cannot find your package on any of the above websites, please contact us immediately.
📧 Email: sales@batterymall.com / info@batterymall.com
📱 WeChat/WhatsApp: (+86) 198 6775 1872 / (+86) 191 2767 3310
🚚 Estimated Delivery Time
(1) Shipping from China:
- To Asia: 5-20 business days
- To North America: 10-15 business days
- To Europe/South America: 15-20 business days
(2) Shipping from Local Warehouses:
- From US Warehouse: 3-5 business days
- From European Warehouse: 2-10 business days
- From Russian Warehouse: 3-5 business days
Please note: Exact arrival times depend on the specific country and customs processing.
⚠️ Tax & Customs Information:
Global product prices include customs duties (some countries require a tax ID). Please refer to the settlement invoice for specific shipping costs. Special handling is required if your package is inspected.
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
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.
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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.