Guys, I have to put my vote on the goal zero solar charger. These things will charge about anything. In good sun i can recharge my Garmin Rino in 4-5 hours. The Goal Zero has the adapters to charge most phones as well as your AA, and AAA batteries. This is my second year using a goal zero and I am totally satisified with the unit. Spring bear hunting where we typically spot a bear then leave a guy behind with a spotting scope and radio to guide the other in. In this situation I will burn through a set of batteries on my rhino in 2 days. It was so nice to always come back to our bivy site and have freshly charged batteries, assuming you have sun of course.