I used a mini mag for years. Got tired of always trying to hold it in my teeth when I needed both hands to on my bow rope, put on my harness etc. Now I always use a headlamp. Keeps both hands free and most can switch to use multiple bulbs like LED, red light or flood. The red light works well to not spook game. I can't tell you how many times I had the crap scared out of me because what I thought were reflective tacks turned out to be a pair of eyes from something that let me walk right up to it.
I also always keep a backup ready to go in my pack in case the batteries die.