If you want a good battery powered light, I'd quite happily recommend the Fenix BC30 or BC30r, the latter being usb rechargeable version of the former.
It's a really bright light, up to 1200lm for about an hour, or 500 for 2-2.5 hrs, although performance does drop a bit with temperature, though that's to be expected. You'll get a bit more if you run 3400mah batteries, as I'm only using 2600mah. The biggest plus for me is the swappable batteries, which makes it really flexible, however you will need to get batteries and a dedicated charger on top.
I regularly do an extended 40-50km commute home with this light, mostly along country roads or offroad paths, and do that off one charge.
It's a really bright light, up to 1200lm for about an hour, or 500 for 2-2.5 hrs, although performance does drop a bit with temperature, though that's to be expected. You'll get a bit more if you run 3400mah batteries, as I'm only using 2600mah. The biggest plus for me is the swappable batteries, which makes it really flexible, however you will need to get batteries and a dedicated charger on top.
I regularly do an extended 40-50km commute home with this light, mostly along country roads or offroad paths, and do that off one charge.