The new battery can be charged up to 70 per cent within 2 minutes and has a lifespan of more than 20 years – more than 10 times longer compared to existing lithium ion batteries. Scientists at Nanyang Technology University (NTU) in Singapore have developed the batteries and say they could have a revolutionary impact from mobile phones to tablets and especially electric cars. Electric car owners could save huge amounts on battery replacement costs and recharge their vehicles within minutes, according…