I have the Zebralight H600W MkII in neutral and it is the finest headlight I've ever used! If you go to www.illumn.com and order it there shipping is free and if you enter code "Illumination" they will knock 15% off your order. I'd get the light and a couple of the Panasonic NCR18650B's. For a charger I'd recommend one of the following (I have both and they work really well as battery packs for recharging):

http://www.fasttech.com/products/0/...-102-universal-usb-smart-charger-version

http://www.fasttech.com/products/0/10002784/1381305-enb-enb-tri18650-1a-3-18650-li-ion-battery-usb

Pick up a solar panel and you could have unlimited power anywhere for small gadgets!