Should You Upgrade Your ESCs? Why Would You?

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There is some confusion about how motors draw power from ESCs. Also about using larger mAh batteries. Hopefully this video clears up some of the confusion.
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Here are some of the ESCs shown in this video:
LittleBee 30 amp ESCs:
LittleBee 20 amp ESCs:
1306 Motors:
EpicRC MN2204-3200kv Racing Motor:
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