What does it mean when someone says their social battery is low when they're hanging out with you? Does this mean they don't like being around you?

I ask this for a couple of reasons. I was friends this woman a few months ago. We were hanging out and I thought the conversation was flowing really well, but out of nowhere she was like, "Oh my social battery is running really low. I'm going to leave now." It was really bizarre and I didn't know what to think of it.

. Am I just really annoying to people and they're using this is an excuse or is it something else?

I never thought of one-on-one conversations as capable of lowering ones social battery so I'm thinking they didn't really like talking to me but were trying to think of a polite way to end the conversation.