I always wondered if electric brush cutters were strong enough and apparently they are but you need loots of batteries!
Makita dur369az is quite powerful but also needs 2 18volt batteries to run... 2x 5ah is the bare minimum.
Let's make my garden a bit more presentable. https://youtu.be/NOhZakWtu9M?si=hM3SmwszoQtBHtAy