Hello All, I'm going to be needing a portable charger for my S2 which I want to order today (UK) and wonder if anybody had any recommendations? Bearing in mind it takes an age to charge via USB, are there any that charge quickly? I used to have a Mophie Juice pack for my iPhone which was also like a protective case and was thinking of something like that rather than a general USB that works on everything. Any ideas? Thanks a lot.