Sometimes you just need a little extra juice. Snap this case-cum-external battery by Mophie onto your iPhone–it recharges the device to give you up to eight extra hours of talk time, 11 hours of Web surfing, or 44 hours of music. Available in four colors.

Go to mophie.com/realsimple to enjoy a 25% discount sitewide now through July 31, 2011, or while supplies last. Limit five items per customer.