Does anyone make a battery case for the iPad 2 where you can use the iPad while it's in it AND doesn't require the iPad cable (i.e. the iPad plugs into it, a la an iPhone with a Mophie Juice Pack Air). Does this exist?
Because the perfect iPad needs to be a pound heavier?
Kensington sold one for the original iPad but I'm guessing it didn't sell very well (they never released one for the iPad 2). The current system of plug-in batteries seems to be the answer for most users as opposed to bulking up the iPad itself. I have a Joos solar batter that's about the size of the iPad. When I'm in a situation where I won't be near power for a while the iPad gets charged in my bag when it's not being used. That way I'm still carrying and using the light(er)weight iPad when I need it and charge it when I don't.
A case with an integrated rechargeable battery that adds extra life to the device. Makes some sense for a phone where a few extra ounces is a decent trade-off for longer usage. The iPad version adds serious weight (the Kensington weighed one pound) to a heavier device so it's not very desirable.
I think you're stuck with those external battery packs. I saw this one on this site before and looks quite small and charges very quickly. Still haven't bought one as I can usually find a place to plug in, but can see it's usefulness while traveling.