Waste heat has been a challenge that scientists and engineers have been pondering for decades. What can be done with this lost energy and can it be harnessed in a useful way? As combustion and technology improved, the percentage of waste heat has decreased, but it is estimated that up to 50% of all industrial energy is lost through waste heat. If that heat could captured or used in a meaningful way, society would move closer to a circular economy. While Derek Hall and his team explored how different battery chemistries might change a battery’s power and energy output, they discovered new opportunities for turning waste heat into stored electrical energy.