Which battery we would recommend would depend on the size of your motor. As the motor gets bigger you will need a bigger battery. Please check the chart here for average run times for the batteries: https://lh6.googleusercontent.com/sSrZ2x-l6fkwqBYM4gKtCg9yuevPDY_GkJ0ZTF2VSo5wMm54P2sYvioULgDG3OBk0xJox63gCm9jvFR6ne2AoCiQkJAYbK1jAst22wkfuleO9WfaOfjYtO9h2ncwkVzDyaiIEibqIxowRJIfQOuPptE