Arlo Pro 3 Floodlight battery life is determined by a few factors. The main factor is how often the light is used. If the light is used frequently, the battery will need to be replaced more often. Other factors that can affect battery life include temperature and humidity.
In general, Arlo Pro 3 Floodlight batteries will last for several months before needing to be replaced. However, if the light is used frequently or in extreme conditions, the battery may not last as long.