Quote:
Originally Posted by Dantilla
My Miata uses an AGM battery. As long as they're used regularly, they last quite a while.
When I bought the one currently in the car, the sales dude asked if it was a Summer-only car, as the AGM batteries don't last as well when they sit unused. Between my wife and I, the car is used almost daily.
I've been extremely happy with Optima red-top batteries. They are the longest lasing batteries I've ever used.
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Quote:
Originally Posted by wdfifteen
This is the exact opposite of everything I've heard and of my experience. Optimas were great in my cars that sat a lot. They could hold a charge for months. Due to the huge increase in price and recent QC problems I went back to liquid batteries + maintainer for my cars that sit.
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I've had good luck with Optima batteries that sit, but the Miata battery was dead after not being used for a while. I bought the current one when we put the car back on the road after not being used for a while.
I've got an optima that came from a wreck I bought at an insurance auction years ago, used only when I need the winch to pull something onto the flatbed trailer. Sits for months on end, and hasn't failed me yet, even though it rarely gets charged.
I wonder what the difference is between the Miata's small rectangle shape and the Optima's spiral cells. Any guesses?