ZAGG sparq Portable Battery Charger for Apple iPhone 4
Worked as advertised for a few weeks of use with my work BB and iPhone. By the end of the month performance tailed off and was only able to get a 75% charge on the iPhone with it fully charged, much less than the advertised 2 full charges. I've had it for almost 6 months now and it is just a brick, can only charge the iPhone or BB 10-15% with it fully charged.<br />I'd recommend something else, not worth carrying around a brick for the minimal use.