Just remembered I had a dream that one of my lead acid batteries in the server room was undergoing thermal run away and I had to disconnect it and in the dream I disassembled it, like if it was a computer, and there was lot of weird stuff in it that you would not expect in a battery and I was telling myself how it was cheaply made and I'm never buying that brand again. There was a pump that was running and it was ensuring that all the cells ahd equal amounts of acid but they were all low, so I had to add more and see if it clears the fault.
Now I'm sitting at work wondering if I actually do have a battery at home that is going under thermal run away.

Had it happen once already. I really need to add some per-cell temperature sensors.