I ran my mightycross for an entire season rain or shine, seemed more rain than shine last year. I had no issues with the lamp at all and the battery was on top of the neck. I will say it never occurred to me to be concerned about the battery pack. I wanted a decent lamp but wasn't willing to spend over $250 for one. I thought that was more than I was willing to spend as it was but I wanted a decent lamp. As I said I am very pleased with it so far. I don't know anything about any of the other lamps mentioned, I can only comment on the one I own.