I have created my own battery usb charger (it takes d batteries and gives a usb port). I simply placed a resistor to a data line and that was it. I understand t

I have created my own battery usb charger (it takes d batteries and gives a usb port). I simply placed a resistor to a data line and that was it. I understand the idea of power negotiation, but felt like it was way more work than it was worth. I didnt need any complicated circuitry; just a battery, resistors, a couple of wires, and a small dc-boost circuit (to drain the batteries as much as possible).