I have a corded, electric tiller that I found at a garage sale a few years back. Wasn't looking for one, but . . .
It's a Remington 'Garden Wizard' - about the size of a Mantis tiller. 12 Amps. Works well turning over our small, established, city garden patch. Simple. Convenient. Low maintenance. Only use it for an hour or 2 per year (unless neighbors borrow it), so that works out for me.
Will be interested to hear how your 40V version works.
Philbert