Florida State Statute 784.03 defines battery as when a person
actually and intentionally touches or strikes another person against the will of the other, or
intentionally causes bodily harm to another person. This is the definition for the misdemeanor charge.
In order for the charge to be elevated to the felony level, certain other criteria must be met. Aggravated battery, a felony, is defined as when a person
intentionally or knowingly causes great bodily harm, permanent disability, or permanent disfigurement,
or, when a deadly weapon is used.
There are provisions within Florida Statutes for elevating a misdemeanor battery charge to the felony level when the battery is committed against particular people. Some of those instances include battery on someone who is pregnant, battery on a law enforcement officer, battery on a person older than 65 years of age and battery upon any employee of a school district. (The school bus driver is Albert M. Taylor, DOB 5/4/1939, age 66).
It is, of course, up to the prosecutor to decide what charges s/he will formally prosecute, but these will probably stand (imo).