I have asked people who gave it to me, they work at battery recycling center. They told me not to worry as soon as this cast made from internal contacts and wires of battery (not from internal nets, which includes pure lead, lead sulfate and many more elements) and do not include strontium - the most toxic metal in battery, moreover they are not sure about strontium content in modern Europian batteries, for sure there is no strontium in Russian batteries.
They suggest me to cast the same way I did it before (taking in mind that lead is poison) in well ventilated areas or better in open air.
Also they told me, that battery lead allow is great add to stick wheel weights to make lead shot.
