Navimow i110N
Rated for 0.25 acres and 30% grade — that is 16.7°, not 30°. On a real lawn, once you allow for borders and travel paths, plan on about 0.2 acres.
What it handles
Two-wheel drive, which caps how steep it can work. That is a flat-to-gently-rolling rating — a real slope will stall it.
Navigation is satellite-based without vision or LiDAR, so heavy tree cover is a real risk — it loses its fix under canopy.
If your ground is steeper
These are rated for a similar area but hold more grade than the Navimow i110N’s 30%.
How confident we are
Cross-checked against the manufacturer and at least one other source.
Slope corrected from 45% to 30%: the 45% figure belongs to the i2 AWD series, not the i1 series. Official Segway i-series manual gives 30% inside the work area and 10% at the boundary. Segway EU spec page shows 45% and 1500 sq m for this model, contradicting Segway own manual - manual treated as authoritative.