I just bought a set of Milwaukee Li-Ion tools- M18 series. The battery showed 75%. I cut 30 pieces off of a 2X4, then put the battery on the SawZall, and went around the yard, trimming dead branches up to 6" with a brush cutting blade. I then put it on the drill, and did about a dozen 1-1/2 holes before the battery died. The circular saw is great; they turn at lower RPM, so it takes a little longer, but not much. I noticed that the 6-1/2" blade is very thin. I would imagine a very sharp blade would help battery life and performance as well. Sometime I'll have to take a fully charged battery and see what the little saw will do. BTW- Most battery circular saws are left handed (???) I prefer it, since I am left-handed anyhow. Worm drive corded saws are usually left hand, too.