The only way at the moment is to buy a power brick from mophie or another manufacturer.
Tho to be honest I've got an air and jp for my 4s I don't think I'd want the added bulk on a 5 given the extra length
How do you like the power brick? I might have to try it. 12 hour workdays in the hospita and I can't afford for my phone to die--which it has done, everyday since I got it.
Oh
Just checking in here. Has anyone found anything yet?
Nothing yet. Happy with the "anker" from amazon
http://www.lenmar.com/Uploads/File/landing-pages/index.html
Can't vouch for the company or quality, just found it.