first things first....
as to how to dispose of the old batteries.
#1 choice is to put them in matts front yard
however, the battery place will charge you more for the new battery without a core. but it would be worth it.
#2 choice would be to put them in the bay and use them as wheel chocks.
heat is not good for any battery. it decreases the life. however, i dont think your engine compartment is an issue.
i am not aware of any restrictions on agm or gel batteries and where you place them. of course with a agm battery you can even mount them upside down if you want.
later
tom
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