I have been using a Knog Blinder 4 LED for over two years. It will go about 45-50 hours on a charge if you use the slow blink setting. The early rap on these lights was that the rubber strap (built in, non removable) would crack then break. I have had no such problem. It just works and built in USB plug means I can plug it in nearly anywhere (Car, Home, Office). About a 4 hour charge from dead battery.
