Seemed like a thread in which to insert this. I don't ride at night, so my use for lights to be seen so I use the first blink function, not necessarily to see. I have a Cygolite (Metro) headlight and the Cygolite Hotshot taillight. Use them on every ride regardless of whether it is sunny or overcast. I generally throw them on the charger after each ride, or every other ride. Today, after a one hour ride, decided to just let them go and see how long they last. The headlight completely died at 7 hours, I would give it 6 hours of good visibility and function. The taillight, well it is still on, and its been 8 hours! Just an FYI and I have no connection to the manufacturer.