Mostly hype. The solar panels are so small on those cheap rechargeable packs that they would take days to recharge the battery bank. I have tried a couple of those cheap ones, and they just don't work well.
You know I kind of figured the same thing but I wanted to get an opinion from somebody who’s actually used one. Thank you I think I will save my money. I’ve got some pretty good battery packs already that you got a charge home but they will charge just about anything on my bike until they’re dead anyways LOL
