I am not sure the brand of batteries, bought at Costco in July 2014. Motor home is not plugged in, I have it in outside storage with no access to power to charge the batteries. The unit was parked on Saturday with the panel showing the batteries were on float charge, by Tuesday the batteries were dead. I tested the specific gravity while the batteries were discharged and all cells tested fair. I turned the battery disconnect in the battery compartment to off when I parked it.