le-yo-ra said:or perhaps use laptop battery... kinda expensive though.... lol
9.6v RC car batteries @ radioshack for $19.99 US
http://www.radioshack.com/product/index.jsp?productId=3999878
or 7.2v 3.3ah for about $28
http://www.radioshack.com/product/index.jsp?productId=2147160
they are smaller, light weight, dont break the bank and can easily be wired to a variable voltage converter that they also sell for under $3
5v http://www.radioshack.com/product/index.jsp?productId=2062599
12v http://www.radioshack.com/product/index.jsp?productId=2062600
Adjustable voltage http://www.radioshack.com/product/index.jsp?productId=2062601
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