I received this as a free promotional item; it was pulled from a box full of these chargers. It had the mini usb to fit my phone.The other end of the cord plugs into the battery case. It's similar to a headphone plug. It did not make internal contact.The battery case is cheap plastic. China would be embarrassed to stamp their name on this. This was probably the failure point with the above cord.Product did not work even with minor attempts to fix it. Threw it away, kept the free AA batteries.Great idea, but cheaply made and did not work. I'd buy it for the listed $0.75, but only if you have free shipping. I'd pay $5 for it if they made it out of quality materials.