I tested it 6 times. Possibility to receive tripple result, if is really, it can occure very rarely (1%?) .
The cost is 20 energy and in my opinion if you will pay this 20 energy for 3x8energy battles or 4x6energy battles , you will receive similar result in training droids.
Training droids is second thing most wanted in this game. The first place are shards for rarely chars like Ima-Gun. The credits are not in first 3.