These batteries seem to be all right. I have two headlights and two batteries, one per light. My commute is about 40-45 minutes. I rode three times in the afternoon with lights on high beam and two times in the morning in the SOS mode* and the LED is still green. At least on one light, the other is messed up and the LED is always red... eh, MS quality... The cable doesn't get disconnected inside the pannier either (I was worried about that). I'm going to order two more as spares, but I'll email GeoMan first to check how they're doing with the replacement batteries.
*Two lights in SOS mode create a nice blinking pattern, better than the strobe mode
