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@turnpedal
I use revo hub/light.
Then Sinewave revolution with a female connecter for the revo light cable soldered on (I have spares if people need, they are hard to find).
I then charge a cache battery when the light isn't in use, and have an inline low capacity battery for the garmin that can take charge at the same time as charging the garmin. Batteries that allow this are also hard to find!
I spent a fortune on battery packs before I found ones that I'm happy with.