ASUS ZenBook S13 UX392 UX392FA UX392FN Battery C31N1821 50Wh

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.