You need to extractAA batteries along with a battery bay which you can find in any non-usable battery powered toy. Then you have to solder a small circuit around that connects to a USB port. Put it in a box and there you are, assembling your very own battery bank. Compared to a $50 battery bank, how much would it cost? $10, may be? It is certainly a no maintenance requiring gadget other than replacing the AA batteries, which you might not if they are rechargeable. Also, there are options of having a 4 AA battery powered model too. Interested, but not feeling prepared? Catch a well detailed DIY guide to this project here.
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