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By 2035, if you want to buy a new car in the UK, it'll have to be 100 percent emissions-free. A Cambridge company's hoping to fix one of the big barriers that can stop people getting an electric car: the length of time they take to charge. Nyobolt produces ultra-fast charging batteries, but bringing the new tech to market isn't easy. Janine Machin looks at the challenges of battery charging. (Picture credit: Getty Images).