MTD lawn machine will not restart
I have a 10-year old MTD lawn machine. I can fully charge the battery, run the machine for 10-20 minutes, turn it off and it won't restart. The motor turns over a couple of times very slowly before the battery is totally drained. The volt meter reflects that the machine is charging. When it cools off, it may restart. Also, when it is running, a lot of what looks like exhaust smoke is coming from the hose that connects from the motor to the bottom of the air cleaner.
Please help.
Thanks