When setting your BATCH_SIZE, please keep the following information in mind.
During each time frame/window (defined by your chosen Schedule), outstanding logs will be batched into groups and sent. The size of each group is determined by the BATCH_SIZE value.
In other words, during each window, NUM_BATCHES batches of logs will be sent based on the following logic:
IF (NUM_LOGS modulo 100 == 0):
NUM_BATCHES = (NUM_LOGS / BATCH_SIZE)
ELSE:
NUM_BATCHES = (NUM_LOGS / BATCH_SIZE) + 1
In the ELSE case, the last batch will have < 100 logs.