There are a few external battery packs for iPad and iPhones in the 6000mah and 10,000 mah range. Assuming that they are lithium batteries can I take the on flights in hand luggage? IATA has directions on the topic see http://www.iata.org/whatwedo/cargo/dgr/ ... rFlyer.jpg
But I ca to work out whether the external battery packs would be above or below the 100wh limit.