So, I just recently got this flashlight addiction, thanks to the good people here. I keep an Arc AAA on the key chain, and the SF L4 in the car. I figured "one day" I will need it. I also figured that "one day" was very far off, and maybe even unlikely. Well, I got the SF L4 just a week ago, and the Pila battery Charger yesterday. A few hours ago, I saw the deer as he was bouncing off my car. Was cool to have a very nice useful light in this situation. I had it because I now have a sense that you need to have one around all the time, and because of the battery charger and the small size of the L4, I have it full charged and in the car at all times. On a side note, the L4 was smaller and more useful than anything the 5 different police who arrived had with them.