See http://en.wikipedia.org/wiki/Nol_pros. This isn't legal advice.
A battery or an assault are crimes of violence. A battery or assault charge for a healthcare professional is never simple. Healthcare employers are concerned with patient safety and therefore any crime of violence indictments or convictions may raise concerns. Human resources and nursing management may not review your academic and employment references because the criminal conviction raises a bright red, white, and blue flag. Crimes of violence may scare a prospective healthcare employer who is concerned with patient safety and potential liability.
Speak with a license defense attorney in your state or jurisdiction. Maybe you can have those criminal records expunged or sealed. You need to determine if the conviction is a bar to employment in certain healthare settings. For example see this document which is available and directly applicable to Ohio nurses. Download Criminalchecksohionurses.
Criminal convictions especially those of violence directly impact your ability to complete clinicals or externships or internships in healthcare, your suitability for licensure before a state healthcare licensing board, and your employability. If you have a criminal conviction or any criminal charges where you were not "acquitted and found not guilty" by a jury or a judge and you essentially took some kind of plea, talk to a license defense attorney in your state/jurisdiction before you spend tens of thousands of dollars on an nursing education and training you may not be able to fully use or find gainful employment because of your past.
I know it isn't fair and its like you are being punished twice but this is the way of the world especially in healthcare and you want to know what you are getting into before you dive head first without a helmet into concrete swimming pool with two inches of water. I am so ready to open our pool; only 3 more months of cold weather here in Cincinnati! I wish I lived in Arizona or Nevada.