Cordless Rotary Hammers compared to corded Rotary Hammers are more compact and give you absolute control to do the jobs you needs to. You can take these tools anywhere you need to and punch holes through lumber or bore easily into concrete with endless power. Cordless Rotary Hammers arelightweight and due to not having a cord, give the user unlimited freedom of movement. Cordless Rotary Hammer are powered by rechargeable batteries. lithium-ion batteries that now a days are widely used , are durable and have a good runtime.