this post was submitted on 31 Jan 2024
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[–] [email protected] 41 points 9 months ago* (last edited 9 months ago) (2 children)

Considering that a 12V battery has an internal resistance of 20 milliohms, the potential current through this thing would be approximately 600A.

It might be too hot to handle (pun intended)

[–] [email protected] 5 points 9 months ago

You can also get that from just the label. The CCA rating (cold cranking amps) is the max current that specific battery can supply in short bursts. 600 CCA is pretty typical, but I've seen up to 900 in the batteries I ship.

[–] Anticorp 2 points 9 months ago (3 children)

Is it really 600 amps? That seems rather high. I do know that the one time I shocked myself on a car battery, it rocked my world much more than getting shocked by a 110v outlet.

[–] MrPoopbutt 6 points 9 months ago (1 children)

V = IR Assuming 12.6V 12.6 = I* 0.02 I = 630

So yeah, it could hit 600A, if only until it got hot enough to melt something or change the chemistry

[–] Anticorp 2 points 9 months ago (1 children)

Well that explains why it hurt so much.

[–] ghterve 5 points 9 months ago

My guess is you were burned more than shocked.

[–] [email protected] 1 points 9 months ago

Wait you can get shocked on a car battery??? I thought 12V was too low for you to feel.