Scientists at the European Association of Geochemistry , grew bacteria on magnetite . One species of bacteria harvested electrons from the mineral and another dumped electrons back on iron in the mineral at night . The amount of energy stored is too low to be used as a new power source . But other species may create stronger charges for natural batteries .
Scientists at University of Tübingen , Germany , grew bacteria on magnetite . One species of bacteria harvested electrons from the mineral and another dumped electrons back on iron in the mineral at night . The amount of energy stored is too low to be used as a new power source . But other species may create stronger charges for natural batteries .