I am in the process of replacing my battery. I hooked up the Argus Battery Bug this past weekend and it indicated that my battery has 22% life left. The Bug's instructions say at the 10% warning alarm imminent failure at anytime, replace battery immediately. Anyway, I have been looking at the Deka ext20L. In the process I see the Big Crank ext20L appearing to be the same battery. Are the Deka and the Big Crank batteries made by the same manufacture in Pennsylvania?