Whats the big deal about USB rechargeable bike lights? Are they really that much better than traditional battery-powered ones? I mean, aside from the obvious eco-friendly aspect of reducing waste, do they really offer any significant advantages? Are they more reliable? Do they have longer battery life? Are they more compact or lightweight? And what about the recharging process itself - is it really that much more convenient than swapping out batteries? Ive seen some USB rechargeable lights that claim to have a quick charge feature, but how quick is quick, exactly? Can you really get a decent amount of juice in, say, 10-15 minutes? And what about the lifespan of the rechargeable battery itself - how many charge cycles can you expect to get out of it before it starts to lose its oomph? Ive seen some claims of up to 500 charge cycles, but is that really realistic? Are there any downsides to using a USB rechargeable bike light, such as reduced brightness or a higher upfront cost? Id love to hear from some of you who have experience with these types of lights - what are the real-world benefits, and are they worth the investment?