I had a little wounded bat in 1998. It had a broken wing and all vets in the county were on vacation. I gave it milk and cream to eat but it died after a week or so. It's buried in a cigar box behind the woodshed.
Yeah bats are pretty cool, but they're hard to take care of. Milk and cream doesn't really do the trick man. If their wing is broken they're kind of fucked, because they eat while flying.
To feed a pet bat, you gotta let it fly in your house and let a few moths go. They'll eat those, and come back to you. I had a bat as a pet once, and they're smarter than I thought.