If there's one thing I can criticize about the iPad, it is it's weight - - it's pretty darn heavy for something you wield with one hand. Having read that the iPad has two large battery cells inside which provide that amazing ten hour battery life, I started wondering whether I could get by on half that battery life if the iPad was significantly lighter. So I dug up the specs to see what the actual difference would be... The wifi iPad weighs 1.5 pounds (24 oz), and according to the ifixit.com teardown, the whole battery weighs 5.22 oz (148g). Therefore removing half the battery (one of the cells) would decrease the weight of the iPad by 2.61 oz to a total of 21.39 oz or 1.34 pounds. Doesn't sound like that much, but it is almost an 11% decrease in the weight, and when you consider the significance of any decrease in weight when it's levered out at the end of your arm, I think it's a valid consideration. For me personally, I think I would take the lighter iPad. I guess I've been trained to recharge my iPhone every night so that I have enough battery life to get me through the next day, and that doesn't seem to be a burden. And with the iPad, I tend to use it more at home, so charging never seems to be an issue - - five solid hours would be more than enough, in trade for a 1.34 pound iPad, imho.