The less than stellar performance of the iPhone's battery has lead to a booming market in peripherals that greatly extend the period of time between recharges. The latest device to join the club is the iPWR from Wireless Input. This accessory, a 1800mAH battery that snaps onto the bottom of your Apple smartphone, promises to extend standby time for up to 360 hours, music up to 40 hours, video up to 10 hours and talk time up to 7 hours. Not too shabby. In addition to the iPhone 3G, iPWR is compatible with the original iPhone model, the first and second generation iPod touches, the iPod nano (3rd/4th gen), iPod (5th gen video), and iPod classic. It sells for $59.95.