They are useless. Also dangerous. The chainstop chaps don't work on these things due to the instant torque and will rip right through them. Only professional use for these is if you're a climber and need to do some limbing. Home users out there in their jeans are gonna get torn up. Chainsaws are serious tools. Far too many people are needlessly hurt. The last thing we need is more battery powered saws. I use a gas power saw for the power. My gas saw keeps going till it runs out of gas 100% power till the last vapor in the tank. No way I have patience for shitty batteries I need to recharge and that are not going to work in a year or 2.