a new technology will come which is at least as good as lithium polymer and safe and long-lasting, and judging by how many laptops are recalled, there must be a lot of research into high-power batteries. there has been a fantastic increase in technology from alkaline to cadmium to metal hydrides to polymer, battery capacity has multiplied by five in two decades. but the reason that everyone uses lead in cars is because it's a very cheap and reliable.
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