Joined: Aug 2010
Posts: 12,728
Likes: 2,106
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
For around home, I use alkaline batteries in my tail lights (AAA or AA) because they get very little use around home. Thus, they last all year.
But, for touring on highways, I often have a tail light on all day long, even if it is bright and sunny. And I have very bright tail lights, so I run rechargeable AAA batteries and charge them after about a week and a half to keep them bright. In the past I carried a charger that I could plug into an outlet, but now I have NiMH chargers that are USB supplied.
Hopefully I will be able to keep all my batteries charged with my dyhohub. But with GPS (AA), tail lights (AAA), camera (Li Ion), headlamp for my head (AAA) and tablet or smartphone (micro USB port), I suspect that I may at times be looking for an outlet to sit next to in restaurants for the tablet or smartphone.
The USB port that my bike has is only a hair over 500 milliamps, so there won't be a lot of excess power.