Senku, Magma and Chrome explores a cave for tungsten, which they’ll need to make durable filaments for their cell phone vacuum tubes. But Magma has other plans in mind.
Manganese that's used 
for manganese batteries!
!يستعمل المنغنيز في بطاريات المنغنيز
Il manganese delle batterie al manganese!
Manganês é usado em baterias de manganês!
Пригодится для марганцевых батареек!