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Solar storage help Answered

Hello! I'm new to the forums, but I've read many instructables.

I'm looking to create a solar-charging messenger bag. I decided on a powerfilm flexible solar cell that is 7.2v 200mA. Amazon has them for slightly above $50.

I originally wanted to use a xtreme mac Incharge portable to store the power,(PLEASE CORRECT ME IF I AM WRONG) but I think that may take too much to convert it from 120v in to 7.2v in. The benefit of this item is that it has two 1w usb output charging terminals. That means faster charging. 

The second idea is to send the solar energy to four AA Energizer rechargeable (1.2v 2500mAh) NiMH batteries. The benefit of using AA batteries is they can be used for other things and that they can be easily replaced after running through charging cycles(I don't know the life cycle of rechargeable batteries anymore).

Any assistance offered would be greatly appreciated. I have the bag, will be ordering the solar cell later this week, found the incharge portable at a thrift store, and always have plenty of batteries and wires.

Thanks!

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