Whats the difference between laser pointers that use AAA batteries and others? I am going to buy my first laser and it is 300mw. The cheapest one is around only $60 and it uses 2 AAA Batteries. The other ones use other batteries but they are $100+. Is there anything wrong with lasers that use these batteries? Are they less powerful? The other ones are 300mw too. Any help would be greatly appreciated, thanks.