[Qbot2640]

Unless your pneumatics system has a leak and/or you have an extreme shortage of batteries, I can't imagine the compressor taxing your system that much - especially given your statement that pneumatics is not that critical in your design. Can you just put more air storage on your robot, and run to recharge between matches...then change the battery to a freshly charged one before starting the new match?

Our team has used pneumatics extensively each year I've been involved, and we have never had an issue with the compressor running down the battery. In 2012 we had a 18" stroke 2" bore cylinder on our shooter - and two other smaller cylinders...our compressor ran almost constantly, but we never had a battery issue. (We have had air-supply issues...)