You may not pay any mind to it, but you should be storing your LED flashlight, or any flashlight for that matter, in a specific location. As many manufacturers, including Energizer, have pointed out what you need to do is to store the LED flashlight in a dry and cool location; one in which is in a convenient and easy-to-reach location. The reason for this is one, so you can easily access it in an emergency situation and two, storing it in a hot and wet location can accelerate the defects in a flashlight. This could include battery leakage.
As such, avoid at all costs, storing the LED flashlight indirect access to the sun or underneath the car seat in your vehicle. It is not very difficult to do so; so, do not get lazy and find a go-to location that you can store your flashlight.