If you are wanting to do a battery conversion it is simple, hardest part is removing plastic for a 4 battery AAA holder. As xya mentioned option 8, he has a step by step battery conversion dyi on his site. After my 1st battery conversion its only about a 30 mintue job for me, and I have bad eyesite and shaky hands I am doing my 1st conversion, a 150, and all I have to work with is hacksaw and Dremel. About the cheapest ready made conversion that I have seen is in the $400 plus area. Hope this has helped.