If you travel frequently, you’re probably lugging around a clunky array of backup batteries for all your wireless gizmos. Soon you’ll be able to lighten your load with Medis Technologies’s new nine-ounce disposable Power Pack. When your iPod dies mid-flight, you can plug it in for a full on-the-spot recharge. The 1.3-watt device will do this five times. It will also deliver five full charges for your digital camera or 20 hours of talk time for your cellphone before it’s spent.