Well there is only one problem left. Yesterday I was trekking all over the place in 25 degree weather. Than I was driving around with my bag in the trunk. When I wanted to test the light out with a filter I had to wait for the batteries to warm up. Lithiums get cold and they loose the charge very quickly. I have had similar problem with my cameras. With photo equipment I always have a warm spare in my pocket and just alternate between the sets. Also after few days of carrying the strobe rear cap seems to loosen up all by itself.

Matt