I own an ego twist, Apollo Vtube, and Itaste mvp and I recently went camping and all my batteries went dead . I decided to find something that I could take on the go to charge my cell phone and E-cig batteries . I found this on Amazon and was wondering if it was safe to use for charging my ego,mvp, and apollo ... The ad says the input is 5 volt just a little weary after seeing the ipod dock blow up an e-cigarette in the news .. I just don't want to get stuck smoking analog's when I'm out camping .