Does anyone have any experience with these Deltran Lithium Supersmart Batteries. They're suppose to last 6-8 times longer than lead acid and have better cranking. They are more expensive, but may be worth it if they perform as advertised.
I did talk to a guy who had tried one. He said it worked great until the temperature got below 40 degrees and then it wouldn't even turn over. I did notice that all of these batteries say the operating temps are above 40 degrees. I went with a Yuasa YIX 30L-BS.