I'm starting to think that there are 2 "social battery" factors.

I'm a clinically shy person but sometimes I have plenty of social energy but still experience high levels of social pain. So the battery model doesn't always fit, or does it?

I recently learned about fast and slow twitch muscle fibres. Some twitch fast, some twitch slow and some do a bit of both. Slow twitching is aerobic, which means it burns oxygen. Fast twitching is anaerobic, which burns sugar. The sugar burning way has a bi-product. Lactic acid (or a "cojugate base lactate" (whatever that means)). Point is, if you're "quick twitchy" then over time you're going to have higher pH levels.

I think that's the other reason why we call it a battery. On a bad day it feels like D cells right on my tongue. Alkalising the 'ole diet and excersing with tai-chi like slow twitch intentions doesn't solve it all, still, I'd recomend it like heck for the toolkit.