[zmmmmm]

If you really don't care about size there are plenty of options, especially for phones like the Note3 with replaceable backs[1].Even for the iPhone you can buy a wrap around case that embeds a battery.

[1] http://www.amazon.com/Hyperion-Extended-Compatible-Internati...

[bane]

Yeah absolutely, but I wish it was just part of the phone model.

A Note 3 with the pack you linked to could easily do 2 full days of medium to heavy usage.