I do not know if new model is better than old. However, consider that what you care about is voltage.
1. Get the volt meter. ($5 - $15)
2. Remove seat.
3. Set up your meter according to directions that come with it - black lead in one plug, red in the other.
4. Select correct voltage range (Probably somewhere around 20 - letting you see a range between zero and 20 voltd)
5. Turn on meter.
6. Place red lead on the red lead of battery, black lead on black. Note reading. Repeat. Write it down.
7. Start bike. Repeat test by again putting red to red and black to black. Write it down.
8. With your right hand holding red lead to read, and your left hand holding black to black, use other arm to rev motor ... :^)
9. Write that down.
10. Do some arithmetic. I'm not sure what you WILL see on a brand new bike...(14.5 volts!?) but all of us reading this post are interested.
Perhaps, if with the new model, hyosung has addressed this, then the rest of us can simply get a hyosung part as a replacement too.