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Hey, this is a cool design for a good looking decorative birdhouse. However, just two things if you want to make a usable birdhouse for actual bird use. First, take off the perch outside the opening. The birds don't need it and squirrels and other predators can use it to enter the house. Second, the size of the hole is somewhat important and dependent on the type of bird you want to use the house (and important in keeping out pests like starlings). You can usually find the preferred hole size in a quick google search.
By replacing the battery with a fully charged one.