Tech Tent: Will better batteries persuade us to go electric?

This week, the UK government announced that sales of new petrol and diesel cars will be banned from 2030 - just one signal among many around the world that a major shift to low-carbon motoring is under way.

In practice, that means millions of people are going to have to be persuaded to choose an electric car - and on this week's Tech Tent we explore how improvements in battery technology can make that happen.