UPDATED: Taranis Q X7, QX7 LiFe Battery Door/Cover
milehigh3d.com
This extends the battery life of your transmitter and now makes a great stand too.
I wanted to use a LiFe battery on my Taranis so I would not have to use a separate external battery for the R9M transmitter module. The 10V LiFe 3S was perfect for the R9M's maximum of 12V. The battery I use is a Hobby King Turnigy 1500MAh LiFe.