OK since I posted about fitting an extra battery to my Kudos Tourer I've done it. I've got the bottle battery from my Typhoon fitted to the Tourer. It works. I just need to tidy up the look of the wiring and stuff and it's a goer. I also need to get the rain to stop so I can get out and try it on the road.
I've tried it on my Tacx rollers in the garage and it seems fine.
I've tried it on my Tacx rollers in the garage and it seems fine.