Batteries purchase on the road? Where is the best place?

Wherever you do buy them, ask if there is a nation wide warranty.

KW and Pete if I recall, you have to return to original POS - Freightliner or Fleet pride I think are nationwide.

Don’t help you to return a dud when you’re 1000 miles away.

 

royal king

 

Napa. They are bloody everywhere, they carry the exact same kinds of batterys as the "big truck" places and often for cheaper, and if you get one that goes dud mode on you because of the 2 above you can swap it out easily. Plus they tend to have a bigger selection such as deep cycles. And a goodly percentage of them have or are near to big truck access and many will even meet you nearby with their delivery pickup for a fee.

 

Group 31 batteries. 750-1000 CCA. (Cold cranking amps). I replace all 4 the same amperage when 1 goes bad.

NAPA Commercial Battery 18 Months Free Replacement BCI No. 31 950 CCA BAT 7236 | Buy Online - NAPA Auto Parts (napaonline.com)

Any store that sells big truck parts usually sell batteries. Most dealers and parts houses.
Good luck.

 

Napa has good filters too , what i used on the backhoe and what not

 

Not sure what inverter you have but on my Magnum I can set a low battery cut off, maybe check to see if you have that on yours and it's set too high? My generator is set to come on and charge my batteries when they get to 12.2 so I have my low battery cut off set at 11.8 so my inverter never cuts off due to low voltage. I have a Bolt custom sleeper with a RV fridge on new batteries I can watch TV, have the fridge running and lights in the sleeper for about 8 hours or so before the generator kicks in.