It will run for about an hour then stall, can a weak battery cause this? My battery has 12.73 volts after it dies. I have it on a trickle charger all the time or it won't start the next day. After it dies I turn the key nothing happens, I have to jump start it with my truck. I have had the battery tested in the mower running and out of the mower after it was charged at advance auto both tests says the battery is ok. I put the tester on the battery and the voltage goes is at 12.68 when the mower is running. Is battery dead, should I start with that?