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7 August 2015 Last updated at 17:15 BST
The company's chief Elon Musk hinted at the device in December, describing it on Twitter as a "solid metal snake".
After the firm revealed a video of the charger in action he joked that it "does seem kinda wrong".
At the moment the gadget is just a prototype and the company has no plans to sell it in the near future.
An electric car charger that can find its own way into a vehicle has been unveiled by Tesla Motors.