Well if you want to get super sciency, there's a point during a motor's startup phase where it's technically drawing infinite amperage.
Most motors spike in the 40-90A range on startup. Some batteries just take it better than others. For example my 15-30C 1200mah batts on my ptw have no issues doing rapid semi auto and those motors draw 18A in full auto, so it's likely spiking pretty high on startup.
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