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#1  

It depends.

The VCC is limited only by the 5v voltage regulators, this is combined over all 20 digital ports and is 5A total.

The signal pins can give 25mA per port.

All of the details can be found in the Manual

To add, it's just mA not mAH. mAH is like MPH in a car, mA is like the distance in the same analogy.