Just my $.02 here.
I never used the standard batteries. I was told by Thor reps to change out the factory batteries before taking delivery. Thor says they just use cheap batteries that will work, but aren't the best. It as recommended to buy higher end 6V batteries, preferably 4. I upgraded mine once the RV arrived at the dealer before taking possession.
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2017 Thor Challenger 37LX, Westward interior, Riverside paint job. Upgraded to 4 battery setup, Splendide 2100XC Washer/Dryer combo, Progressive Industries HW50 EMS, Heavy Duty Steering stabilizer, and TST TPMS 6+4 setup for tow vehicle . Member FMCA
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