I use RCR123a with the same DX flashlight, best to go with the higher spec 16340 protected cells, such as the AW RCR123a though

http://www.lighthound.com/AW-RCR123a-Protected-750-mAh-Battery_p_114.html

The Soshine RCR123a from DX are also OK

http://dx.com/p/soshine-700ma-3-7v-rcr123-a-batteries-pack-with-carrying-case-2-pack-13811?item=1

The Nitecore Intellicharger i4 will allow you to charge 4 cells at a time.

http://www.nitecore.com/video.aspx?id=54