Not a recommendation for any specific headlamp, but may help in the use of a headlamp/flashlight.

My wife asked me to check the batteries in her LED headlamp as it was starting to dim out in use. The battery pack is the cylindrical type common to LED lights and uses 3 AAA batteries.

I tested the batteries and found that 2 were near full charge, while the third battery was totally dead. This seems to be a common problem with this type of light.

The obvious way to maximize battery life would be to periodically rotate the position of the batteries in the battery pack and allow the draw down of each battery to be equalized thru the life of the battery(s).

Just my 2 cents worth.