In the interview, China Regional President of Vive at HTC, Alvin W. Graylin, told the publication that the company will sell a bigger battery for the add-on in the future. At the moment, it will only come with a standard battery that lasts for an hour-and-a-half. The bigger power source will last longer, but you'll have to carry it around in your pocket or in a bag.

HTC's Chinese website will start accepting pre-orders on Friday, November 11th, 7AM Pacific/10AM Eastern -- there are no plans to release the peripheral locally in the US and other countries yet. Graylin told UploadVR that anybody can buy one, though, so you can place an order if you're willing to pay for shipping from Asia. That said, HTC is only selling a limited number of units, and you'll have a bigger chance of securing one if you can provide a valid Vive serial number.