Homemade Solar Iphone USB charger (first attempt)

I found an old car USB charger that works with iphone(no brand) Its 12v in 5v out. Hooked it up to 6 X 1.2v 2200.Mah, total of 7.2v going in to the USB adaptor which drops it to 5v… I could use 5 batteries for 6v but decided it would be less fuss to use 6. I butchered a solar bug killer and used its case, I ripped out evertthing except the solar panels Iv not tested them yet to see what power they are. I will do an update with more detail soon.