Just yesterday, I replaced the dual batteries in my 2003 Cummins Dodge that were the OEM units. They lasted exactly 20 years to the day from when I bought the truck new. The replacements were AGM batteries from Walmart, which worked out great because my wife is a pharmacy technician there and gets the employee 10% discount, plus an additional 15% one time discount for Christmas for a huge savings. Today will be the first startup with the new batteries. The old batteries still had a little life left, but not enough for cold weather starts.