Originally Posted by
noglider
The problem isn't so much the battery. The USB chargeable lights are more powerful because the goal of that kind of light is different. It emphasizes putting out some real light, whereas the coin cell light is just to be there and say you have a light. You should have someone ride your bike and look for it. You won't really see it.
Here's a brand new Blackburn on the left, and a 'Thunderbolt 2.0' USB on the right.
They're about the same brightness (bright but not blinding), but the coin cell one gradually gets dimmer while USB ones stop abruptly.
The one actually mounted on that bike is rather dim by comparison so I need to change the battery, but it still puts out some light.
Re: the Specialized ones, the problem seemed to be the switch, the mounting of the light onto the base, the mounting onto the bike,
and the battery.
I like Specialized overall just not this item, but it's also a peeve of mine- lights that won't last even one ride, & leave you in the dark.