A client brought in his STIHL battery mower because the trigger switch was broken. I opened the control box, replaced the switch and tested the machine. It's fiddly to replace the switch, but I have determined the easiest way.

The client phoned today and said the mower runs for only 10 seconds before cutting out. If he puts the mower down safely on its side, it runs fine. On a hard surface with no grass to cut, it will not run.

It is my first STIHL battery mower, so I'm rather stumped.

The batteries are charged, so I am wondering if there is a torque issue with the motor.

I would appreciate any insight from others.

Hi Changy.

I've not experienced this issue myself.  Any warning lights or error code lights flashing?

Also, I suspect there is a tilt switch on the machine to prevent it working if tipped up or working on too steep a slope etc, so wonder if that has something to do with it. Not sure if it has one or if it's separate to the main controller if I'm being honest, but if it's come loose and sitting at the wrong angle it could explain the issue.

Unfortunately I left the main dealership a while back to work for myself, and no longer have access to STIHL technical info.