Why won't my homemade phone charger work?
I'm trying to make two projects. First I'm trying to charge my phone with 4 AA battery's connected in series. Second I have a solar panel I want to use to charge each of those AA's individually. Heres my plan as it stands. I hook up my solar panel to one rechargeable battery with a diode in-between so when its cloudy the battery doesn't put its juice into the solar panel. After I finish charging each battery I wire all four up in series and connect that directly with a charging chord for my phone. I defiantly do not understand this concept so help me were I go wrong. However I've run into some problems. When I cut the cord to my phone charger I found a string of wires under neath the first layer. after cutting deeper I found a red,black,green, and white wire. Assumeing the others didn't matter I attached the red and black wires to the positive and negative ends of my 5 volt emitting AA battery set up. My phone didn't register it was charging. After reconnecting all the wires to their original usb, and plugging that into the outlet the charger worked again. So my first question is why can't I just put voltage to the red and black wires and how do I make this work with my homemade battery pack. Secondly After hearing some awnsers I've become concerned that this AA set up will damage my phone if I don't have a device that cuts off the voltage when my phone is charged or when my batterys drain to low. How do I fix this easily and without having to buy special components. I have a beginners arduino set so I can spare any of the components in that. I,m sure I'll have more questions as I go along but this is it for now. Thanks so much for your input I need the help.