So I used my new Cordless Mower today. I upgraded for this year. The new mower is a Greenworks 40V 21" Cordless Brushless Push Mower. Cost was $365 with tax. 1 battery and charger included.
It mulched great, including some leftover leaves. Mower worked great, the lawn was not a full cutting yet so I can’t really judge time. I would guess equal to a 1/2 to 2/3 cutting. Took under 20 minutes including handling the battery on both ends. It used about 1/2 the charge I believe. It is amazingly quiet also. No cord was a lot easier. A full cutting took 50-60 minutes with the corded mower.
Bonus with this mower, the handle easily folds fully down and the mower lifts up to be pushes like a hand cart and stores in this format taking up a lot less room in my garage. a very nice bonus.
100% confirmed, no need at all for self-propelled.