I'm so amazed that my Amaron battery is 4 yrs and 2 mos old and still going strong!

Before I bought my Amaron, my stock car battery lasted 3 years. I replaced it because I was afraid that it could die anytime and I don't want to wait for that anymore. Looking back, maybe I should not have replaced it because it could have lasted some more months or years.

The stock car battery and Amaron are the longest I've had. All the other batteries I bought would die right after the warranty expires so only a little over 2 yrs. Could it be that batteries or cars are getting better?

I'm curious, what's the longest period before your car battery died?