The best I can tell, some of you folks are trying to force something too big into something too small! Being inquisitive, I got the trusty tape measure out to measure what I got. Well, it seems about 5 inches one way and about 6.25 inches the other is the most I could stretch my hole. The Mighty Maxx recommended by others is way too big for my small hole. I had to find a smaller battery which wind up being a lawn mower type battery--BTX14BS. 2018 P1K5D. Not sure how this smaller battery will work.