Why do I need a switch for a solar battery/usb charger?
I just browsed online and skimmed through other peoples' projects and failed to notice everyone using a switch. I then thought about it and my 4 solar cells where scavenged from lawn lights that used a light sensitive switch (can't think of the word at the moment). However I had already put my idea to work (without a switch) and I drained the batteries to around 1v a cell by charging my phone over night, and then I happily placed my charger out in the sun without anything hooked up via usb and when watching voltage it was going up at an ok rate. Well hours later I go back to check on it and the voltage dropped back down, now my cells are under 1v a cell. The solar panel is hooked up positive to the battery pack positive, there is a diode between, then after that connection a usb female connector is put in after that, and they are all grounded to the same line. I am confused as to where the batteries could have drained to, and why everything can't be in parallel, although I admit I am pretty newbish, but the logic still doesn't make sense to me.
Thank you for your time. (sorry the image looks like it was drawn b a 3 year old)