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I'm sorry to hear about your situation.
California law defines battery (also sometimes called "assault & battery") under section 242 of the California Penal Code. A California battery is simply this: "any willful and unlawful use of force or violence upon another person." Penal Code 242 is known as a “wobbler”. Wobbler’s are offenses that may be charged as misdemeanors or felonies depending on the circumstances surrounding the case.
If the battered person is seriously hurt, the criminal case may be prosecuted as a felony under Penal Code 243(d) as a "Battery Causing Serious Bodily Injury." If the battered person doesn't suffer serious bodily injury, the criminal case will typically be filed as a misdemeanor (otherwise known as a simple battery).
Note that this is willful and unlawful. It doesn't mean negligent / unintentional / etc... and that means that you could have a defense. I certainly would still get an attorney, as it is a criminal matter, and having a criminal record (misdemeanor or felony) is a very serious matter. But regardless you can still go and plead your innocence, that nothing was ever intended and that you never meant to or actually did cause any harm. The burden of proof would be on the prosecutor to prove that you did (beyond a reasonable doubt).
That being said, you need to contact an attorney in your area that deals with criminal law cases. Go to www.lawyers.com or www.legalmatch.com to find an attorney in your area. You should be able to find one that will give you a free initial consultation and better advise you of your rights, any problems with your case, likelihood of success, how courts are treating cases such as yours in your area, and what you should do next.
Hope that clears things up a bit. If you have any other questions, please let me know. If not, and you have not yet, please rate my answer AND press the "submit" button, if applicable. Please note that I don't get any credit for the time and effort that I spent on this answer unless and until you rate it positively (3 or more stars). Thank you, ***** ***** luck to you!