Thanks all called thor with my vin and thor said not to use lithium batteries because the coach is not wired for that? Called interstate battery and they said use AGS 27 group but if 31 group fits better. DavidEM looks like group 31 will fit. Interstate will install group 31 for $160 each. Said I need 3 extra inches in the step battery area. I have it in the shop at pierce rv in montana. Since it dropped from 12 4 to 9 with nothing running could be bad cell? Maybe warranty will cover since new.
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