My daughter's partner has tried a Bosch corded mower (Rotak 43) and
it's equivalent battery version (Rotak 43-Li).

He finds that for average lawn cutting, and particularly wet grass,
they are equal in capability and yet the corded version has a 1700w
motor and the battery one is driven off a 36v 2.6Ah battery, which
rather obviously can hardly deliver the same electrical power.

Why is the lower powered DC machine equal in capability with the much
higher powered AC driven mower? Is it in the mower design or are
modern DC motors (I'm presuming they are stepper motor type design)
that much more efficient and powerful?

Rob