Batty slimes love to lurk cold, dark places, like caves, swooping down from ceilings to scare others with their glowing, red eyes and pointy fangs. Hm? No, they're not vampires. The glowing eyes let them see in the dark is all. They also greatly dislike garlic because they eat fruit. Seriously
While in darkness, like caves or at night, batty slimes grow hungrier and will eat more often than other slimes. And while they can survive in sunlight the sun's searing rays freak them out a bit, increasing their agitation over time. Again, no, they are not vampires
Batty plorts have significant potential for navigation and sonar tech. Each plort can produce a perfect "ping" for echolocation. Having a supply of these and the right know how could allow you to navigate even the most devious of labyrinths with ease. But then again, how many of use find ourselves needing to do something like that?