Only a battery made from non-mined & biodegradable material would be affordable (for the planet).
"Globally those in slavery, though small in absolute numbers (est. 40.2 million), contribute disproportionately to environmental destruction and carbon emissions. If modern slaves were a country, they would be the third largest emitter of carbon dioxide in the world, after China and the United States"
From forests to factories: How modern slavery deepens the crisis of climate change, Energy Research & Social Science https://doi.org/10.1016/j.erss.2021.102096.