This is the ideal solution for High Tech Pet Doors located too far from an outlet or if your home is prone to power outages. As only the cord is included with the original door, the High Tech Battery Charging Kit allows you to keep one in the power dog door at all times, and one battery on the charger.
Depending on the extent of usage, the batteries will need to be rotated approximately every two weeks.
If you are planning to run the door strictly off battery power, you would want to choose the option with 2 batteries as the high-tech battery solution so that you will always have one charged and ready and one running the door. Using a charger and battery kit eliminates the cord needed and ensures usability during power outages.