[jmatta]

I've stored my cars for years with the battery on board and connected, utilizing a maintainer; never have I had an issue. Be aware, any time you disconnect the battery for a period of time, your engine control unit will clear all of it's settings and go back to factory default, forgetting all your driving habits. It takes nearly two weeks of various driving patterns to re-acclimate the ECU back to a full "ready" status.