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Today on my iPhone I can press a few buttons to know exactly where I am and how to get directly to my destination.
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Batteries power the tech you spend most of your time with, but the design of the lithium-ion batteries commonly used is decades old, and severely limiting. Better batteries wouldn't just mean a week of smartphone use, or longer Netflix binges - they could make electric cars viable, provide a boost for renewable electricity, and maybe make your laptop a little lighter.