VEVOR Rotary Hammer Drill, 1-9/16 in SDS-Max Cordless, Heavy Duty 20V Battery Powered Rotary Hammer, Including 2 Batteries, Charger, Drill Bit, Pointed Chisel, Carrying Case, for Concrete, Masonry

No — this VEVOR Rotary Hammer Drill 1-9/16 in SDS-Max Cordless uses an SDS-Max chuck system, not SDS-Plus. So the standard 6-piece SDS-Plus chisel bits will not fit directly into this hammer drill. if this answer does not resolve the current issue, please contact us again for assistance.

No — this rotary hammer is not designed for Makita 18V Li-ion batteries. if this answer does not resolve the current issue, please contact us again for assistance.

No, the batteries are not compatible with Dewalt 20V batteries.

Battery life is related to the operating current, and is typically around 8 minutes.