Cordless rotary SDS hammers
If hard concrete is what you're dealing with, a rotary hammer is what you need. Unlike normal hammer drills that produce small percussive motions, rotary hammers’ air-powered piston delivers high energy shots to the rotating bit.
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Brushless motor, 3-function, SDS Plus, 2.0 Joule shot energy
20V 4700bpm 2.0J Cordless Brushless Rotary Hammer Drill - Tool Only - WX381.9
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3 tools in 1, SDS Plus, 1.2 Joule shot energy
20V 5000bpm 1.2J H3 Cordless Rotary Hammer Drill - Tool Only - WX390.9