Just in case somebody else needs an audible warning, my one tweak (after installation) -- in case I'm not in front of my laptop when the battery gets low -- was to add an alarm. I found a nice WAV file of a siren ("siren.wav" - it has to be a WAV file for some reason), put it in /usr/audio, and edited the cbatt file in ~/Startup to read so:
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#!/bin/sh
cbatticon -l 5 -r 3 -c "aplay /usr/share/audio/siren.wav wmreboot"