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BlueMoon said..
Why do you need a hammer drill?, i stopped using hammer drills in the 1990's, if you've got more than one hole ever to drill in concrete, it'll be worth getting a SDS rotary hammer.
Not a tradie, but I wondered that too. Good cordless and a cheap corded hammer drill if doing a bit of concrete.
A proper rotary hammer if doing lots.
You need the weight in the drill so its hammering the material, not bouncing the drill back at you. And inertial torquefor when you hit stuff (ie heavy rotational mass in the guts of the drill).
Theres a reason you don't see 1kg rotary hammer drills