Apparently the good people at MIT have developed a new battery that uses carbon nanotubes to hold a charge. This new nanotechnology is 10 fold more efficient than conventional batteries. I can't wait until these start being viable for use in vaping. Here's a link.
http://pesn.com/2006/02/09/9600232_MIT_Battery/
http://pesn.com/2006/02/09/9600232_MIT_Battery/