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Interstate is the only battery I've seen last 9 years, and still hold 14.4v 700cca at 7 yrs before it started to drop. I misdiagnosed a bad starter as a bad battery and traded in a 6 year old Interstate on my truck. Big mistake, but it was too late to get it back from the core pile by the time I realized my mistake, and the Everstart or whatever the F this O'Really trash is I have now... it's 3 yrs old and some days it's at 11.8v on a cold morning.
Driving, the alternator shows 14.4v and floats around 13.9-14.4v, but when the key is off it drops to 12.3v-11.8v.
Last edited by JP Hayes; Oct 23, 2024 at 12:03 PM.