Mini and nunchuck are configurations that can both use the same sized cells, so there's no real difference in performance providing the cells are the same.
It's very difficult to predict battery performance, due to variations in gun tuning and playing style. I've had my 9.6v 1500mah peter out towards the end of a near-freezing day, after approximately 1200rds.
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"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."
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