Dana, the space in the enging compartment is very tight for my Bonanza, changing a battery is a real chore, so 2 would not fit. I did use an Odessy in my other plane, light. small and worked fine, but dont think they make 24 volt ones. I think we will use the same Concord I have if we do replace it, may not need a new one at all, hope not they are expencive>
Thanks