Still searching for original asus ux510uw battery? Here is exactly what you need:

Brand new asus ux510uw battery is available now! The battery only costs 110.42 NZD and it is free shipping to most countries. DHL express is also an option. This battery could replace with part number ASUS B31N1534,0B200-02030000. Also this battery could fit in ZenBook UX510UX, UX510 U5000, U5000U, U5000UQ, U5000UX. 

The detail below is for your reference:

Voltage: 11.4V
Capacity: 4240mAh (48Wh)
Battery cells: 6-cell
Chemical: Li-ion
Battery Color: black
Condition: new original battery
Warranty: 9 months