You definitely need to speak to a criminal defense attorney. I would also not air much of it on this forum, as its criminal in nature and you want to best protect his interests.
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The 273.5 as a felony carries up to 4 years in custody, the 136.1 could add an additional year for a total maximum in this case of 5 years.
The code sections you listed are these:
273.5 = spousal abuse (or felony domestic violence)
13700 = definition section, not a true charge he faces in court, but it just designates that this is a domestic violence case
136.1(c) - dissuading a witness (from either reporting the crime or attending court).
The 136.1 is a strike.
That's what they're looking at and what the maximums are.
What a person actually gets depends on the facts of the case, their prior record (if any), what they can actually prove against them and what their attorney can work out on their behalf.
Based on the allegations alone, they stand a good chance of doing time in custody. They need a good criminal defense attorney.
The above answer is for general information only and is based on the information you posted. Every case is fact dependent, so to get a thorough analysis of your situation, you will need to consult face to face with an attorney licensed to practice in the jurisdiction where the incident took place. Do not conclusively rely on any information posted online when deciding what to do about your case.