Get the 880 or 1000Cca 12 v batteries. Low batteries will eat upYour starter and cost you a lot of $$$ and headaches. Clean terminals and if the bus is a wreck take your batteries home with you and return them. But only fresh batteries and the 880-1000 Cca will do well. Oh and don’t use Marine batteries. Hey are not designed for start and stop.
Cheers
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