If radiolink doesn't fix my issues than I'm thinking about going with the nb4 all the way. Was thinking about futaba, yes it might be a little more reliable, but with the nb4 you get the color and touch screen and a few more settings. Not sure if I want reliable and dated or very modern and lots...
Extra battery backup?
The base battery I think it can work as a power bank as it charges the main one in the grip and it has a usb port on it, most likely for firmware updates and you can charge your phone when your on the track. No clue, but seems innovative and cool.