American technology billionaire Elon Musk recently wagered $50m that he'd be able to build the world's biggest battery within 100-days. It appears that the Tesla boss has won that bet, having helped...
The event will be streamed live on the company's website from Apple Park campus in Cupertino
The new machine will be based in Abingdon in Oxfordshire
Acknowledges many small problems that still remain to be solved