ZDNET's pick for the best robot mower overall is the Mammotion Luba 2. This all-wheel-drive robot lawn mower uses a virtual, GPS-powered boundary and can handle up to 80-degree slopes and mow up ...

The mower runs on a replaceable 40V lithium-ion battery, which works universally across the Greenworks 40V series of lawn-care tools. Charging the battery takes one to two hours, and a full charge ...