Originally Posted by PaulRivers

The best I've found for light recharging is to use plugin-to-recharge lights, then store my bike indoors (including in a garage) and hook up the charger to the light without even removing the light from the bike. It's dead simple (if you don't need to leave your bike outdoors somewhere), and removes almost all worries about the batteries running out on the ride. (Still had batteries go bad over time and run out of total capacity).