low end laser battery question

I have one of the "decent" red lasers, actualy adjustable.

Runs on 3 button batteries like all the rest...best batteries to buy? longest lasting? best storage?

Lithium batteries will store for up to 10 years, but they are very expensive and can be hard to find.

Check out the online battery dealers, you can buy 100 in bulk for what Wally Mart charges for 5.