High heat is worse than extreme cold on batteries and temperate weather is the best, but yeah, I’d just get them load tested and then go from there.
From the interwebs , seems like the newer trucks eatbatteries more.
Wonder if it is more likely withthose who’s trucks sit a lot between uses and the parasitic draw on the batteries.
Experienced that with a fleet of trucks waaay up north. We stranded probably 50 trucks and another 100 pieces of various Const equipment for the summer, for about 6 months.
Had 15-20 brand new 2014 Rams with literally 100-200 mi on them and ALL of them were dead as a doornail and some wouldn’t take a charge. 70-80% of the rest of the equipment fired right up.