With the ridgid kit ive used, the Circ saw lasted very well. We used it to rip all the ply wood for the subfloor for an addition we are working on and also used it to cut around 20 or so studs before it died out on us. for just running off one battery i thought it was very nice. This kit has the Hi capacity batteries which are 2.5 amp hour i think. Know if you were doing alot of cutting the battery saw probably wouldn't be the best idea since the batteries do die but it only takes 15 minutes to charge!