1.4 ounces - charges in 4 hours http://news.cnet.com/8301-17938_105-10153057-1.html The iphone is 4.7 ounces. Thats 6.1 ounces for 3G cell, (half decent) camera, ipod, journaling, email, internet and (crappy cell based) GPS all in one and now no worries about battery life. Not to mention about 50 other uses for this device including e-books. I may do this.