I only have small groups of bat pictures but it was a group (20-30 bats) in a tree over the river. Large bats (est. 2ish ft wingspan) based solely on visual from the ground. Also the location is imprecise as this was before I had my phone with GPS all the time. Possible a Peters's epauletted fruit bat although I don't know the bats well enough there to know if other species with a similar appearance would be there too?