Lead acid batteries are highly toxic and cause severe environmental damage as well as to all Lifeforms due to the presence of Lead.
Li-ion batteries are today used once and thereafter discarded. Thus, ending up in a landfill, where they pollute the land, air and water.
There is a lack of Reuse and Recycling results in an immense amount of resource loss due to this wastage. India imports all it's Li-ion batteries currently and dumping them means only increasing our imports bills and pollution levels continually each year.