i live about four miles from the deka factory in Lyons,Pa. Last time i was there was Feb. 08 for a pair of 2nd's for the M-1009. I think they are group 31's, about 1050 or 1150 CCA. And the pair was less than a C-note. They sat on the garage floor all summer with no charging,(the truck was apart, but that is a WHOLE other story). A few days ago i put them back in and after five months of no charging and the truck not having turned a single engine rpm, the batteries lit it off on the second pull. The factory store did have 6TL's in stock, at about $110 ea. It just wasn't in my budget, although they would have looked right at home. The counterman also said that they did not always stock the 6TL.