According to the Ego mower manual, you should avoid cutting wet grass with your electric mower for two reasons. First, the moisture can affect the electrical components of the mower and cause serious damage not covered by the warranty. Secondly, using your mower on wet grass is a potential safety hazard and can cause you to slip or fall and potentially injure yourself. Wet grass can also present maintenance and cleaning challenges. It can become stuck on the deck and other components, and unlike gas-powered mowers, you can't just spray it off with a hose. As long as you stick to cutting dry grass, you'll have a much easier time cleaning up.