No we are just going to use an old car battery.
Actually Red Cross/American Heart assoc. both teach the CPR together with the AED. But, it has been discussed that the various 'Sport' clubs (QCBC, FORC, CBRC etc.) around the area may want to buy an AED together. It is rare that more than one club would have an event on any given weekend, so the unit could be shared. Something to think about.