After a lot of reading and thinking, I've reached the following info and conclusions:
An iPhone 4 or 5 takes about 8 Wh to fully charge from dead.
A pair of AA NiMH (Eneloop) takes about 5 Wh.
A pair of AA lithium primaries hold about 9 Wh.
A Powerfilm USB/AA charger is 1.5W and weighs 6.3oz (with two Eneloop AAs, rqd for USB).
Raw battery specs:
NiMH AA 27g 2.3Wh 0.08 Wh/g (eneloop)
LiPo 86g 18.1Wh 0.21 Wh/g (many choices)
Li prime 15g 4.5Wh 0.31 Wh/g (energizer)
I don't like charging directly from solar to phone 'cause I'm moving. I like to charge an interim battery throughout the day and download electrons at night. It usually takes a couple days to deplete my iPhone, and a few days to deplete my 2 AAs. There are good and bad solar days, so I need extra capacity.
So first, the battery should be at least 10Wh. Second, the solar should be at least 2.5W for 8 hours of charging at half capacity. This should give me twice the power I need for my devices.
This stuff all weighs too much as purchased (other threads dig this in detail), so I will be repackaging (like many others have done.) What inspires me to have at this anew is that the naked powerfilm cells are only 10g per watt. The nylon canvas backing that comes with the USB/AA unit weighs 1.9oz!
I add up a total about 3.4oz including 2.4W panel, 10Wh LiPoly, PCB, AA holder, and case.
Add a USB cable, 2 NiMH AAs, and 2 Lithium AAs for 6.4 oz total.