need to make battery packs for lights

if have these little lamps: Attachment 50221 (http://www.doityourself.com/forum/attachments/electrical-ac-dc/50221-need-make-battery-packs-lights-k2-_f10690a4-4f18-4758-a27d-058ab91072a3_v1.jpg) they have regular 2 pronged ac plugs for the wall. inside the can is a regular E-27 socket for a bulb. supposedly they're 60W max. i put these bulbs in them: Attachment 50220 (http://www.doityourself.com/forum/attachments/electrical-ac-dc/50220-need-make-battery-packs-lights-_35.jpg)