Most cordless drills are designed for intermittent duty: drill a hole, drive some screws, then rest. Continuous high‑load use (like spinning a mower reel for many minutes) will:
Heat the motor and electronics quickly, shortening tool life or causing thermal shutdown.
Drain batteries very fast, especially under high torque.
Increase the risk of sudden stall and wrist‑twisting kickback if the reel jams.
You can play with it as a short‑burst experiment, but as a practical “powered mower” solution, a drill will be under powered, hard on the tool, and not very durable.
Powering something with a drill is best with hexagonal shaft in chuck and you can hose clamp the chuck from coming loose.
Most people just fit a scooter electric motor , there are a few on Youtube.
