Powering Jaguars with 24 volts

[hedgeberg]

Hey guys
My team wants to use 18v Banebots 775 motors.
As far as we can tell, we can't get anywhere near the potential of these things with our Jaguars being powered using 12 V. How best can we output at the necessitated 18v?
We've been looking at step up transformers, but those are both expensive and heavy, and we need to find some way to reach the maximum power output of these motors.

We're climbing to the top of the pyramid, and we need enough power to get the robot up that thing.

So yeah, how can we step up voltage for our Jaguars? Or, if we can't step up the voltage, is there a way without stepping up the voltage to power the 18 volt motors at full capacity?

Thanks!