Unfortunately, they don't list that type of information on the website .
I've got one in the '02 oilhead and it cranks the engine over in temps of upper 30's F. with no problem .
Price has gone up since you last purchased one, it's now around $50US, still better than other AGM type batteries .
Just ordered one of these batteries, don't know how long it will last, but batteries live a tough life in this incessant desert heat .
http://www.gruberpower.com/12-volt-18-amp-hour-ah-battery