C21N1701 Asus VivoBook S14 S406U S406UA X406U 7.7V 39Wh/5070mAh Replacement Laptop Battery

Replaces the following products:

Fits the following devices:

Common Customer Questions

Q: How to check this battery is compatible with my laptop?

A: Please find out your old battery's part number or the exact model name of your laptop at first (like 'Asus C21N1701'), then to match our product compatibility chart. Second please compare your old battery to our product images ensure their shape is same. Finally check the voltage(Rating) is same to your old battery's. More details please click How to find one correct battery for my laptop?

Q: Does your replacement Asus C21N1701 battery compatibles with my original Asus C21N1701 battery?

A: Yes, our replacement battery is 100% OEM compatible and guaranteed to meet the exact specifications of your original Asus C21N1701 battery for the Asus VivoBook S14 S406U S406UA X406U. It ensures the same form factor and high performance. In addition, all our compatible batteries for the Asus C21N1701 laptop are internationally certified (CE, UL, RoHS, ISO9001/9002) for safety and quality assurance.

Q: How to charge a new battery for Asus C21N1701 for the first time use?

A: New C21N1701 battery replacement is normally shipped in its partially charged condition. Please cycle your new Asus VivoBook S14 S406U S406UA X406U C21N1701 battery Replacement by fully charge and discharge it for 3-5 times to allow it to reach its maximum rated capacity before use. (Note: it is perfectly normal for a battery to become warm to the touch during charging and discharging).

New batteries are hard for your device to charge; they have never been fully charged and are therefore "unformed". Sometimes your device's charger will stop charging a new battery before it is fully charged. If this happens, simply remove the battery from your device and then re-insert it. The charge cycle should begin again. This may happen several times during your first battery charge. Don't worry; it's perfectly normal.

Q: How to tell if your C21N1701 battery is bad?

A: Here are some common signs that your C21N1701 battery may need replacement:

1. It drains significantly faster than it used to.

2. It fails to reach a full charge.

3. It loses power shortly after being disconnected from the charger.

4. It shows physical damage such as overheating, swelling, leakage, corrosion, or signs of water exposure.