I found that the Trustfire Brand worked a little better than the Ultrafire Brand in 18650 batteries..

The best performers I found are from a seller on ebay.. They are Japanese Brand he sells for 8.50 and free shipping.. The only catch is that are unprotected cells.. I found they have a 10-15% better burn rate than the Ultrafire or Trustfire cells.. When your light drops down a mode, time to pull the cell..

http://cgi.ebay.com/Rechargeable-3-7...d=p3286.c0.m14

On another note, found a real nice mount on ebay too.. Carbon Fiber but the mounting clips are alloy so it gives you a solid mount to your bars.. Comes with adapters so it will fit 25.4, 26.0 and 31.8 bars.. I was looking for a good mount for my GPS, that wasn't too flimsy like the FSA Carbon Mount and found one.. It would easily accomodate 2 full sized lights using the lockblocks.. Take a look..

http://cgi.ebay.com/CARBON-FIBER-COM...d=p3911.c0.m14