THIS WILL NOT WORK WITH A BATTERY.
For the budget-conscious, this is a simple plug-in adapter. Any standard indoor 120 volt plug will work. It provides 12 volts to operate one door.
The disadvantage with this is that if you get a power outage, the door will remain open or closed until power returns. And when power returns, then the door will reset and go into photo sensor mode (opening if still daylight).
We strongly recommend that you only use this with the photo sensor. Without the sensor, when power returns, the door will reset into the closed position and your chickens can get locked out.