This depends on how you're using it, what is the manufacturer's battery life and how you maintain the batteries. Like any other device that require batteries to operate, there is a finite lifespan of the battery so it is always recommended to bring along additional batteries or use rechargable ones to prevent any unsuspecting surprises. Also, it might be a good idea to test the battery life with the level of usage you would use in the wild outdoors prior to your trip.