The sense described here (morale, entre autres) is missing from the top section, although you can get the idea from the combined forms if you scroll down far enough.
Wow, I'd never have understood that without the explanation. I suppose it's connected to the electric shock sense of pêche? That's the only one that seems even vaguely close. Anyway, passing this over to @Lacuzon to see if this is a sense worth adding.
Yep, pêche meaning energy, dynamism may be used alone. Though most of the time it's used with the expression avoir la pêche. I don't know where it comes from.