Most people never even think about battery powered Christmas lights to decorate your house for the holidays.Most lights that are made today for decorating are made with led lights which are very low energy draw. This saves on the worry about always changing the batteries.
Another advantage is the problem of finding a power outlet. This is especially good for outdoor christmas lighting. Having to plug multiple cords into one spot and hiding the cord in the grass is a pain also.
Along the same idea, battery operated Christmas candles have the same advantage. Leaving a light on in the window is much safer this way. With led lights for Christmas, you’ll save on your electric bill as well.