I agree with Fred. Monocrom, why do you say the battery of an HID must be charged after just a few minutes usage? I'm not sure where you're getting this info or if it's by experience but it is not correct. The type of lighting powered by a battery (be it SLA, Nimh, Li ion etc), has nothing to do with the charging requirements (frequency of charge) of that battery other than how it relates to the amount of current being drawn from it. In the case of HID, typical current requirements are 1/3 that of an equally bright (Watts to the bulb) Halogen light.
I also agree with Fred that the POB puts out more overall light than the Thor15 although the T15 (in my case, anyway) has much longer throw.