Well yes, Duracell is a trusted brand. (I prefer Duracell batteries over any other brand) But as far as an external charger for mobile devices, there are just so many better devices to use than what I think this guy is talking about. While yes, this does look to be decent.. it is only 1850mAh. (source) This will successfully charge your iPhone...barely. Even though your iPhones battery is only 1450mAh (i think) it will take more battery to fully recharge it. Honestly, I would not even recommend a battery less than 2000mAh.What other battery packs would you recommend and why? Duracell seems like a trusted brand, why not just go with that one.