Back to Mobile View  Skip to Content  Third Rail zaps iPhone
case market with detachable battery pack   For every gadget that
claims to charge an iPhone on the go, there's sure to be a
constituency that swears by it (or quite possibly at it). With
external battery packs from HyperMac, Zagg, Kensington, Newer
and Monoprice, you can dangle a cable; with battery-equipped
cases from Exogear, Boost and Kensington you can keep your extra
joules right next to your phone. We've seen some clever
inventions (the RichardSolo 1800, the PowerEZ) and too-clever
ones (the X-Power charger-in-a-cable), but precious few options
that give you power when you need it without adding weight,
aggravation and charging hassles.  Since Macworld Expo this
year, I've been happily using the US$79.99 mophie juice pack air
with my iPhone 4 when I need extended power. It's light (about
68 grams), packs a solid 1500 mAh battery and charges reliably
and simply with a Micro USB cable. It's a great product, but it
does bulk up the phone substant