Troy-Bilt 21” Electric Start , needs to be charged or new battery, Not sure, I removed the drive gears because plastic hub broke , it’s Now a push mower needs one rear drive wheel . Could possibly be fixed for the self propelled, not sure.This was $350-$400 new. Now they are close to $600. Needs TLC. It Runs !!! just put fresh fuel in it. Haven’t used it but once back in 2011