Philips Saferide 80.
It has a published run time of 1:30 on high. 8 hours on low.
My commute can be as much as an hour. I need the light on high the whole way. So I'll probably recharge the batteries every day at work, most likely taking them straight from the charger and putting them in the light right before I ride.
Should I use 2000 mAh low self discharge batteries like Eneloops or Duracell "staycharged" or should I use 2400+ batteries that will lose a charge over time.