article_snippet.sent: Musk introduced the Powerwall device at a press conference in California last night and said the technology could 'change the world'.
article_snippet.sent: Tesla also unveiled the 'Powerpack', which is the big brother of the Powerwall.
article_snippet.sent: Musk later added that the entire showcase had been powered by a huge array of Powerwall batteries.
article_snippet.sent: In the past Musk has said such early batteries 'suck' Tesla also unveiled the 'Powerpack', which is the larger scale version of the Powerwall.
highlights_snippet.sent: Musk unveiled Powerwall device at press conference in California .
  