“I can recall reading on various reloading forums that there is a danger of cadmium poisoning if you were to use the lead from car batteries.”
I’m pretty familiar with the chemistry involved in car batteries, and cadmium isn’t there.
Interesting, since I have heard the cadmium poisoning warning from more than one source (of course, rumors are easily spread on the internet). Could it be Ni-Cad batteries and not car batteries? Perhaps the well meaning posts I have read have their facts confused.