I regularly use some type of flasher tail light. I previously used a Planet bike super flash turbo. Periodically I would have to put in new batteries. I figured it might be good to be a little more ecological and try a USB rechargeable light. I found one last year that was nice and compact, good design nice and bright. The problem is that it no longer holds a charge particularly well and actually has gone dead while I am on longer rides.
I am wondering what experiences and opinions others have about USB vs batteries.
By choice, all my lights use batteries. I have a supply of rechargeable NiMH batteries ready so that my lights are always capable of being used. And if any of the batteries becomes un-chargeable, I can replace them cheaply or use alkaline batteries. With a USB rechargeable light if you do a pre-ride check and the unit needs recharging, you have two choices - go without a light or delay your ride.