How to convert from batteries to AC

Basically by wiring in an wallwart to hte battery terminals that matches up to the voltage you need.  Interesting cheap trick.

http://blog.makezine.com/2013/06/03/diy-hacks-how-tos-convert-battery-powered-electronics-to-run-on-ac/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+makezineonline+%28MAKE%29

and

http://www.instructables.com/id/Convert-Battery-Powered-Electronics-to-Run-on-AC/