 It's hoped that improved superfast charging will relieve so-called range anxiety and bring the timing more in line with the time it takes to fill up a petrol or diesel tank with fuel. However, the superfast charges the lithium-ion battery requires are not yet widely available. BBC correspondent Zoe Kleinman reporting. Government officials in Bolivia say they've arrested four more people in connection with a failed coup attempt. That brings the total detained to 21. Among those arrested were military officials.