Lead
That depends on the type of battery. There are nickel cadmium, lithium, lead acid,
These are the platinum metals.
Lithium
Lithium
the answer is zinc
electrodes
it will be useless to use 3 electrodes. IT IS WASTE OF MONEY.Two , three or four electrodes can be used but it only increases the rate of reaction.
lead
platinum
That depends on the type of battery. There are nickel cadmium, lithium, lead acid,
In traditional "lead-acid" batteries, the electrodes are lead and lead (IV) oxide. During discharge, both electrodes dissolve in the strong acid electrolyte to form dissolved lead (II) cations. During recharge, these reactions are reversed. Other battery types, with a longer rechargeable life are used for hybrid electric-gasoline cars.
Lithium
These are the platinum metals.
Lithium
Lithium
oxide
A voltage of 12 V - as used in car batteries - is not particularly dangerous. You can even touch the electrodes, though I suggest not to touch BOTH electrodes at once.