Tesla unveils the home battery
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How would a Tesla home battery work?

1 May 2015 Last updated at 12:05 BST

US electric carmaker Tesla Motors has unveiled batteries that can power homes and businesses.

Chief executive Elon Musk announced the firm would build batteries that store solar energy and serve as a back-up system for consumers during blackouts.

The BBC's North America Technology Correspondent Rich Taylor reports from San Francisco.

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