Battery Adapter 2x2 AA in series

We own the Simplehuman brand automatic soap dispenser. We use it for dish soap in our kitchen. It works perfectly and looks great on the 3D printed platform that keeps it nice and level on the sink and doubles as a hole plug when we changed our faucet. The drawback is that this thing sucks batteries and they always run out when the tank is full which is not removable so you wind up standing on your head to try to replace the batteries with a sink full of dirty dishes. Enough!! This project