> 1. I know that these things have extremely low ESR and can therefore deli=
ver an
> enormous power output. Considering that one has normal skin (not too dry,=
 not wet),
> how dangerous is one of those capacitors charged to 2.5V?

Potentially (pun not intended) very dangerous (see below).

>=20
> 2. Approximately at what voltage does it start becoming dangerous?

Many years ago now (I heard the story about 35-40 years ago) there was some=
 investigation going on into skin conduction. One particular subject had th=
e skin on his hands washed very clean and then dried very dry, before a 1.5=
V cell was connected between his hands. The story goes that because the sur=
face moisture had been removed the current went through the sub-cutaneous t=
issue and shocked his heart, to a point where it stopped.

I have no references to back this up, the story was told to me verbally ump=
teenth hand, so I cannot provide any references, but ma prepared to believe=
 that it would be possible.


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