I love Ubuntu Mate, but I hate how it shuts off without notification
when I’m out of battery power. Does anyone know if there is a way to
configure it so that I receive a notification when the battery is
running low?
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If you have the battery icon in the top panel, click on it and check the settings, there should be a box to warn you!. 
Interesting idea django but if it isn’t a part of the system then I don’t know!. 
Which version of Ubuntu MATE?
There should be an indicator and a daemon running that monitors the battery and shows notifications when your battery gets low or is plugged/unplugged. That's the behaviour on my netbook, which runs 15.10.
Try opening Power Management from System → Preferences → Hardware to see if this triggers the service. It should be automatically started when you log on (System → Preferences → Personal → Startup Applications) as "Power Manager".
You could execute the daemon from the terminal if these fail.
mate-power-manager
I’m sorry for the confusion guys! It started working now. I’m using the beta version of 16.04 and there are little glitches here and there. I should probably wait for the full release before making this one of my main systems haha