It is dark now. The time change is always a drag if you love to cycle outdoors. You are using your bike lights everyday on your commute home from school or work. If you are powering your lights with AA batteries, USB batteries could be more convenient than batteries that require special chargers, in that USB batteries charge from a USB port on any computer.
Usually the realization that the batteries in commuter bike lights are on their last legs happens on a dark ride home from work or school in the evening. If you are disciplined, you will promptly put the dead batteries in the charger, and then make dinner. If not, you will park your bike, eat dinner, chat, mess around on your computer, read a bit, watch some movies, and forget completely about needing to charge the batteries, until the next night when you are cheating death on your dark commute home.
With a couple of USB batteries, you are always covered. You can ride your bike to work or school the next morning and charge the dead batteries you forgot to put in the charger the night before on your computer.
You take off the green top, which is attached by an elastic string (kind of nutty), and plug them into your computer's USB port, just like a USB flash drive. Like many rechargeable batteries, it takes a while to charge them. And when the lights on the batteries indicate that the batteries are charged, you replace the green cap. They are not inexpensive. But they do offer another strategy for recharging batteries. Click to buy some.
