After reviewing this thread and battery issues I looked at the laser I got. The end cap has had the raised button removed on the inside to accomodate the battery length in turn leaving a flat surface. When people try to load the battery with the negative side at end cap it appears to not have a good solid connection because the negative end is a little fatter and than the positive end(could just be the drip line left on the coating). Yes its that tight of a fit. When the positive end is towards the end cap the raised nipple on the battery makes a good solid contact with a better fit and therefore appears to work better.
I could be wrong but this what I got from rereading this.
I could be wrong but this what I got from rereading this.