I was charged with battery and tampering with witness preventing from calling the police

There are too many unknowns to adequately respond to your question.  However, the charges are serious enough that I urge you to retain an attorney to represent you.  The attorney should be able, after reviewing the probable cause affidavit and other documents, to give you a fair idea of whether you have a strong defense, your options, and what to expect from the state. If you are unable, financially, to retain a private attorney, you are entitled to have an attorney appointed to represent you.  If you go to court without an attorney, I recommend before responding in any way, that you tell the judge you cannot afford an attorney and would like one appointed to represent you.  Assuming the judge appoints an attorney, he/she should be able to answer your questions and give you an idea of what to expect.