Colony on Tembabagoyi Island ('Napoleon Island' is the colonial name, but still used), Kivu lake. Estimated to be aroud 1700 bats.
I was under the impression that the colony on the island was much larger, but I might be totally off; it could be also due to a seasonal low. Did you talk to local people whether they see conspicuous seasonal fluctuations in bat numbers?
Here's a summary of observations from this spot:
I've talked to locals, that estimate the population to be "10 millions" bats :-). I expected also to find a bigger group according to what I've heard about this colony.
I've asked about the seasonal fluctuation, people says that they are permanently present on the Island, no fluctuation or seasonal moves was mentioned. Their daily moves, according to locals, are to surroundings Island for night feeding, principally to Idjwy Island on Congolese side of the Kivu Lake.
The Island was quite busy with cows, farmers cutting wood for cropping and tourists visiting. The bats were always on the move during the time I was visiting and also before and after I was on the Island, quite stressed.
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