https://www.amazon.com/BLACK-DECKER-LST420-Lithium-Performance/dp/B00HXCPC6K/
Maybe this one? It seems really good from the reviews.
Based on this, I recommend the Honda HRR. Great mower for $400. I can also recommend this Black and Decker trimmer/edger, it comes with two batteries and has sufficient power for me in my 1/4 acre yard.