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No idea!
But it worked with the battery and now works with the nasty cheap shimano hub. I'm converted. I've always earthed through the frame but I'm hopeful that this set up will be trouble free.
Went for a ride just now and the road was on fire! Stand light works, which is worrying because now if I pop in to a shop I leave a beacon outside.
Only downside is that having no warranty I'll have to carry battery backups, but I would probably need to anyway.
A battery 🤔? Did you buy the DC or AC set?