I used this last weekend and I have the Guide 10 battery pack as well. I was able to recharge the 4AA for my lantern, iPhone, 4 more AA batteries, and my portable speakers in about 8 hours. I was ready for the party every night with fresh juice for all my gear. It even charges when it is cloudy. (not very fast, but some is better than none) It has 12v, 5v (USB) and a port for the Guide 10 pack that can all be used at once. Very light too.