Well, I guess it's time to purchase a couple batteries---both 12V---NAA (12 years old)--641 (8 years old). I've got 65 Group batteries in both and I can't complain about the service. They are both Duralast, but have got so expensive. I can buy three cheap Wally world batteries that size for the same price. They are 650 cold, cranking amps and should do the trick. I have one in my Diesel and it's been cranking well even when it is cold. They say the Value Power is made by Johnson Controls----What is your experience with them?