Ok I have had my kit for close to a week. Here is my question. The kit came with two batteries. Using the same cart, I have noticed one is very hard to pull through and the other is much easier. They both seem to have the same amount of whole in the threaded portion. 3. I am wondering can they get clogged? what would cause one to be so much harder than the other. one is basically unusable? Can you clean them, is it defective? That would be sad as my passthrough is defective.