[EricH]

Originally Posted by Creator Mat

also are previous years batteries still allowed?

Short answer: it depends on which previous year you're talking about.

Long answer:

<R40> The only legal primary source of electrical energy on the ROBOT during the competition is one MK ES17-12 12VDC non-spillable lead acid battery, OR one EnerSys NP 18-12 battery, as provided in the 2010 KOP. Teams may use other equivalent 12V batteries during development, testing and practice MATCHES. However, during competition MATCHES only one MK ES17-12 battery OR one EnerSys NP 18-12 battery can be used on the ROBOT.

And anything else is to be used only for non-competition matches.