http://www.batteryjunction.com/fenix-tk12.html
I like lights that take cr123a batteries. The batteries are shelf stable for 10 years and will only loose about 1% of their charge per year. They will not leak and destroy your light. They can be discharged and thrown in the trash without recycling. You can get them for $1 each if you shop around.
I think lights that take this type of battery are especially good in the gun safe, glove box, or emergency kit for this reason.
The Fenix you are interested in is similar to my Olight except the Olight is more "plain" looking. The Fenix lights I have seen in person were well made and seem like a good value. Good luck.