Systems and devices for lawn care

A lawn mower, comprising

• a plurality of removable batteries;
• a plurality of electric motors supplied with electrical power from the plurality of removable batteries;
• a cutting blade driven by one of the plurality of electric motors;
• one or more wheels selectively driven by one of the plurality of electric motors;
• an angle sensor;
• and
• a controller, wherein the controller is further configured to:
• determine whether a roll angle is greater than a first predefined amount, wherein the roll angle is measured from the angle sensor;
• in response to determining the roll angle is greater than the first predefined amount, stop operation of one of the plurality of electric motors configured to provide rotational drive power to the cutting blade;
• and
• wherein the controller is further configured to:
• determine whether the roll angle is greater than a second predefined amount;
• and
• in response to determining the roll angle is greater than the second predefined amount, stop operation of each of the plurality of electric motors.

A lawn mower, comprising

• a plurality of removable batteries;
• a plurality of electric motors supplied with electrical power from the plurality of removable batteries;
• a cutting blade driven by one of the plurality of electric motors;
• at least two wheels selectively driven by one of the plurality of electric motors;
• an antenna;
• an angle sensor;
• a plurality of object detection sensors;
• and
• a controller in communication with each of the antenna, the angle sensor, and the plurality of object detection sensors, wherein the controller is further configured to:
• determine whether a roll angle is greater than a first predefined amount, wherein the roll angle is measured from the angle sensor;
• in response to determining the roll angle is greater than the first predefined amount, stop operation of one of the plurality of electric motors configured to provide rotational drive power to the cutting blade;
• and
• wherein the controller is further configured to:
• determine whether the roll angle is greater than a second predefined amount;
• and
• in response to determining the roll angle is greater than the second predefined amount, stop operation of each of the plurality of electric motors.