What metal is the battery plate made from?

General purpose flooded lead acid batteries have positive and negative plates made of lead. This is commercial battery grade lead consisting of lead-antimony alloy. A further development is calcium-lead alloy in the lead plates said to give better charge retention, reduced outgassing, higher currents and reduced water loss. Special batteries may use silver-lead alloy batteriesfor superior charge retention, deep cycling, longer life and better performance in wide temperature range. Deep cycling batteries with long shelf life, capability to deliver sustained currents for long periods may use pure 99.9% lead in the plates.