I run a 60 aH Amped battery up front with a 1222, lvl 34, and a Helix 9. I can run for multiple days on that battery. To me the most impressive part of the Lithium is it puts out full voltage right to the end. no hard drop the last 30 percent of its charge cycle. They are definatly lighter and smaller too. Only downfall to Amp is they do not have bluetooth.