I'm currently using a Serfas Thunderbolt USB Taillight. I like it because it is easy to attach/detach and very bright. The one thing I don't like about the light is, it only lasts for a few hours. I typically use the bright flash mode, which according to Serfas lasts for 7 hours. In my observation, it's less than that.

So my question is, are there taillights that are just as bright and last a lot longer than the Thunderbolt? Ideally, I would like to be able to use the light without recharging or changing batteries for at least a couple of weeks. The old Cateye taillight I had was like that in terms of the battery life, but it wasn't nearly as bright as the Thunderbolt. And to be honest, I want my light to look stylish, though that's not my top priority.

Thanks in advance!