Do the batteries pose any type health risk being so close to your head?
No risk. They are completely hermetic
No they do not. There are multiple battery options for this headlamp. I chose the 2-CR123 option as they are lithium, and work incredibly well with LED light technology for both brightness levels and longevity. Nevermind the fact that they weigh half as much as an alkaline battery. I own multiple headlamps and have used them to the point of straps falling apart and I have never had a headache or any other negative physical reaction from the power source.
no they don't. However the light does go through the batteries fairly aggressively. They aren't cheap, but they light is well built.
I really don't know if there is a health risk with the batteries close to the head.
However I do not like the fact that this headlamp uses the CR123 batteries. They don't seem to last and I have had to abandon this headlamp for adventure racing because of the unpredictable battery life. One of my teammates really liked this headlamp but finally gave up because battery issues. These batteries are not cheap or easy to find especially if you race internationally. .
NO - I have used this lamp for many night runs, the batteries will die on you before they start to leak. The enclosure is also water tight.
Never had a problem with the batteries, never got water in there, even when running at night in the rain.
As far as I am concerned, for me its a non-issue.
The version with 4 AA batteries, allows for recycleable batteries, but its just grams more than the 2 CR123's. Either way, the battery comparments are water tight, as I have both.
Hope this helps.