A few days ago, I wandered into Batteries Plus. Noticed Lithium batteries similar in size to my original, and boasting the same 270 CCA. Now that I have my new sled in hand [i.e. in garage] I'm going to pull the battery and take some measurements. While the 1/3 scale battery from WPS sort of worked, some of the time, I'm thinking full CCA and maybe 3-4 lbs is still significantly better than the 16 lb lead acid battery. Price was roughly $130.