Howdy Laura. Please clarify: when you mentioned plugging the battery power cord to the wall, I assume you meant the battery charger? The battery power cord have two ends. One end goes to the Li-Ion battery pack inside the pool cleaner unit and the other end goes to the floating pod. this cord internally has 4 wires (Red/Black/Yellow/White). In the pod there is a hexagonal circuit board with 3 relays that control the power-up sequence/charging/pool motor. The board has a 3-wire connection to the charger (Red/Black/White) that correspond to the 3-pin pod round connector. This connector then connects to the charger with via a cable. The charger has an On/Off touch switch (blue LEDs) and an AC power cord to 110VAC wall plug. Currently, I have just replaced one of that relay (RT44012) and connect everything back up. Everything looked and work normal now. The battery is charging, so i don't yet know if the new relay fixed everything or just a connect/disconnect that brought all back. Stay tuned.