Always-Learnin
Vendetta Love
If you have two units (front and back) it is a simple matter of pulling the good battery and swapping it out. That will at least get you home.Xshifter... now if there was expert battery management the system would select an easier gear just before you were to lose complete power. Otherwise you have to tweak the cable tensioner in hopes that you can manually select an easier gear.
Doesnt help if you have just gone down a hill when the battery runs out. As it means you have to go back up the hill to get home.