Legal Question in Criminal Law in California

None, assuming that he realizes you are unconscious. A taser may only be used to subdue a dangerous suspect. There is no need to subdue someone who is clearly unconscious.

As many times as he can justify in court as 'reasonably necessary'. None, when you are on the ground unconscious. Your problem will be in showing that is what happened. The police reports will likely show a different version of 'facts' than yours. You will probably be surprised to find how detailed the police reports are concerning your 'resistance'.

Of course you can fight the criminal charges. When arrested or charged with any crime, the proper questions are, can you be convicted, and what can you do? Raise all appropriate defenses with whatever witnesses, evidence and sympathies are available for legal arguments, for evidence suppression or other motions, or for trial. If you don't know how to represent yourself effectively against an experienced prosecutor intending to convict, then hire an attorney that does, who will try to get a dismissal, diversion program, charge reduction, or other decent outcome through plea bargain, or take it to trial if appropriate.

If serious about hiring counsel to help in this, and if this is in SoCal courts, feel free to contact me. I�ll be happy to help, using whatever defenses there may be.