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Voltage is not what you have to worry about. Amperage is what stops your heart. And 2 amps coming through a Lightning connector is nothing to sneeze at.

Have you heard of Ohm's law? You need a far higher Potential Difference (voltage) than 5 volts to cause any significant current to flow through your skin (hint: I = V/R where V=Potential Difference, I = Current and R = Resistance) so voltage certainly does matter.
 
my reaction after reading the first post
 

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mag safe packs a bit more punch. Reminded me of when I was stripping land line phone wire with my teeth and someone called. Boy that sucked. But I think that is AC.
I did that once. ONCE!
Darn right. The little static electricity shocks you get sometimes are upwards of 100,000 volts. However, the amperage (current) is so small you don't get hurt.
Maybe you weren't around for the shag carpet era?
 
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