My Walmart starting battery in my MH lasted 9 years. My Walmart batteries in my tow car only last 3-4 years which were replaced twice under warranty. The difference I charged my starting battery in the MH whenever the House batteries reached 80 % SOC. The tow car was charged just with the alternator. Having said that Walmart, Costco, and Sams Club change who they buy from over the years and there have been a lot of reports on here of premature failures of Costco batteries in recent years. The batteries you bought 10 years ago and got good service from may be an entirely different brand today.