I have the latest version Alton on my touring Rapide. It works really well and shows a charge at just over 30mph in top gear. However it did have a tendency to slowly drain the battery if you don't use the bike for a week or so. To fix that I rewired the lights (call me a Luddite but I use a magneto for ignition) so that when the switch is in the off position the battery is isolated. The consequence of my rewiring is that the lights come on as you start the engine even if the light switch is off. I see that as a positive as I always ride with the lights on anyway.
Now, to put that into the context of the question, I sometimes forget to put the switch to the on position and therefore use the Alton as if there were no battery. The only thing I notice is that the lights are dim while the engine is ticking over, otherwise there appears to be no problem.
Now, to put that into the context of the question, I sometimes forget to put the switch to the on position and therefore use the Alton as if there were no battery. The only thing I notice is that the lights are dim while the engine is ticking over, otherwise there appears to be no problem.