eufy is part of the Anker Group and is a latecomer in the lawn mowing robot market—with an approach that sets it apart from the competition: pure camera navigation without an RTK antenna and without a boundary wire. The robot detects the boundary between mown and unmown grass visually and works its way forward lane by lane.
This has a consequence for the mowing system that many people find surprising: when the blades become dull, the image the robot sees changes as well.
When the blades become dull, the cutting edge becomes less sharp. The robot detects them worse, drives more cautiously, and overlaps more—the mowing time increases even though nothing has changed on the lawn. Anyone who notices this should first check the mowing disc instead of adjusting the app configuration.
Dirty camera lens with the same symptoms
A dirty lens produces exactly the same picture as dull blades: longer drive times, imprecise paths. Clean the mowing disc right away with a dry cloth when replacing it—takes ten seconds and prevents misdiagnoses.
Shorter battery life on the C15
Dull blades increase resistance, so the motor draws more current. With the C15’s tightly sized battery, this becomes noticeable faster than on larger models—often it then can’t cover the area in a single pass anymore.
Every additional blade consumes energy. With large robots, this hardly matters, but with the C15 and its tightly sized battery it does. Five blades draw measurably less than seven and extend runtime per charge. If you want to cover the area in a single pass, the 5-blade version is the better choice.