I emailed Cygolite and they sent me a .pdf of the manual. I had misremembered what was in that manual. The three red lights indicate the brightness level at which you've set the light, high, medium or low, not the battery charge. Only the low light indicates battery level by flashing at different intervals as the battery charge decreases. I don't remember it flashing but maybe I didn't notice. At any rate, I charged the battery and now all is working fine. I experimented with the different brightness levels tonight and they work as the manual states. Thanks for the replies!