putting a paper towel between the battery and the carto, and screwing them together with the paper towel in between, works well for me![]()
I'd be really careful with that technique. The extra thickness of the paper towel can push the center posts in too far and conceivably short them out. That can be corrected by lifting the posts, but if the little gasket on the battery ends up damaged, there goes the seal that protects it from liquids.