I'm asking for a liitli insight on hub electricity. I'm am going to purchase the Son Hub, Model 28 ISO Disc, not changing the deciding. I want to charge my front and rear lights, day time running while charging a battery pack. Purpose of the battery pack is to be fully charged so I can charge only a few items:
1. Rechargable headlamp
2. Nexus Tablet

That's about it, I don't have much. I am looking for a setup that doesn't cost much. Can you help?