Is it normal that my Energy Bar is still full even though I have ridden the bike a lot?

Yes. The energy bar takes into account both battery charge and bike performance. As your battery charge gets below 50%, your bike's performance will begin to drop. That is when you will start to see the energy bar decline.

If you want a more percentage based way to look at the battery life, check out the bike's voltage. TAP the power button until you see the VOL stat at the bottom of the display. You will see a number between 42 and 54. This will give you a better idea of the pure battery life you have left. 42 VOL will be nearly dead, and 54 will be fully charged.