noteven wrote:
4 x 6v only giving 12 v must mean they are half worn out in only 7 years. So one 12 v would be good for umm 3.5 years?
Yabut, it is never a linear scale of life with batteries.
I just pulled out 2 UT2200 Interstate that were 10 years old. Still doing the job, but I would rather change them out before I'm stuck somewhere doing it at gunpoint. I don't trust Interstate anymore, so they were not an option for me. I got tired of the monthly maintenance too, so I went with AGM this time. At $500 for a pair, I'm not certain it will be worth it, but time will tell, and it is only money. You guys can limp along on club store batteries if that's what floats your boat.