+1 for the eneloops. I've been using the AAA's for a couple years now on my tail lights, including winter, and haven't noticed that much of a difference between temperatures as far as the frequency of charging, although tail lights take a lot less juice than an 80 lux headlight. Thanks PaulRivers for the battery life info. It seems there's not a huge change in battery life between Gen 1 & Gen 2 in this regard. I tested at 1.7 hrs. before going to Eco-mode and you had 1:53 before noticeable dimming. What you said about the purplish tint was another factor against the Ixon. I still can't get use to some of the car headlights that exhibit this.