I have used several rechargeable batteries over the years, and none came close to this Brunton in terms of capacity and ruggedness. The rubber cover is not only water resistant, but non-slippery, a handy feature in the wilderness. The auto-shutoff is a big plus for more delicate USB devices.
Pros: Large capacity, well built
This review was written in the old system and had content requirements that are different than reviews written today.