I can't say for sure, but I believe Scottydoh means that the pneumatics are charged with an off-the-robot battery before each match. This would not in any way mean adding an extra battery during the match. It would be like me adding 47 extra batteries to our robot when it's not competing. It's not against the rules at all to have pre-filled air tanks. As for the rule stating about not pre-charged electrical things (or something like that), pre-pumped air has no electricity in it. It would be the same if we filled up the tanks with our mouths. And while that is completely legal, it would be stupid to do so. It would be hard to fill your pneumatic tanks to 60 psi by blowing in them.