What is the major differnce between the defense of "self defense" and the defense of "battered person"?

I know we are in the psychology section, but it's not clear to me if you are asking this from a legal perspective or from a psychological perspective. I don't think they are the same.

People who defend themselves from someone breaking into the house, or mugging them, or trying to rape them is involved in self defense. They are attempting to keep someone from harming them or others when the situation arises. This is normal, natural and usually lawful. Some people are too afraid to try to defend themselves though, or maybe they know they couldn't win due to size or that the other person has a weapon, etc.

I think a repeatedly battered person is one who has been physically, emotionally and psychologically battered over a period of time. Some of them feel like they deserve the treatment and after a while they believe there is no way for them to safely escape from this horrible, repetitive and often escalating abuse. They then might plan a course of action to murder their abuser when they are sleeping, or in some other helpless state. It never occurs to them to just leave or if it does they believe the abuser will hunt them down and drag them back for more. And this has happened in some cases, as people, including police, often don't take spousal abuse as anything very serious. It has become pretty widely accepted that people (mostly women) who have been the target in long-standing domestic violence, are not in a rational state of mind when this happens. Anyone else would be convicted of 1st degree murder for planning and carrying out a plan to do away with their spouse. When performing self defense, you are reacting to an immediate, dangerous situation. But battered people are reacting to a state of mind that has developed over a long term. And instead of making a plan to get away and carrying that out, they do away with the threat for good. At present, the law backs them up on this in many places.

I don't actually know, but it sounds like self defense is when you feel threatened and in danger and you take action before the person you feel threatened by, and battered person sounds like you defended yourself after the other person actually did physically harm you.

But don't take my word on it, I'm just going by what seems logical to me.

"self-defense" requires you to be in imminent danger of grave bodily harm; battered person requires that you have a history of abuse which causes you to feel endangered by threats the other person has made (the danger does not have to be imminent).