Would this belt be a good accessory to the watch?

Since apple are not going to let 3rd party groups make battery augmented casings for their watches , would this belt be a solution to our battery drains

https://www.youtube.com/watch?t=137&v=a1Wk9WdT7QE

All we have to do is ask the designer to include a mini magsafe adaptor to it and bingo we have a way to keep out watches topped up when on the go