I'm not sure if it would be worth it or not. You have a base price of $40 and then you'd spend $30-40 on a P7 or MC-E and driver and you'd still be left with the proprietary NiMH batteries. A person could probably install two or four protected 18650's for another $40-50 but now you're in the territory of a Jetbeam M1X, EagleTac M2/X, Fenix TK40 and a host of other high quality lights which are waterproof, metal bodied and have full factory warranties. For me personally it wouldn't be a worth while mod unless I was just looking for something to do.
I opened mine up the other day and took a look.
Re: the "proprietary" batteries; it's a shrinkwrapped 6xAAA pack, IIRC 700mAh, with a thermistor. I think there's room in the light for a 6xAA pack instead, using the plug, wires, and thermistor from the original pack, which I'm seriously considering. The main issue is whether I can leverage a bigger battery pack for more brightness, instead of just more runtime (which I expect is adequate already), and I haven't really looked at the driver yet. If I can crank the current up, then either a high-flux low-Vf overdriven XR-E, or an under-driven MC-E or P7 might go nicely. (I doubt it can be cranked to 2.8A, and it's probably not constant-current up to 6.xV for a 2s2p MC-E...)
Not sure about 18650s -- I don't think you can fit them, but I didn't really look, because I'm planning to preserve the original charging circuit. (And I need to see what the charging circuit seems to be doing -- obviously some sort of smart charge termination, given the beep when the battery's full, so I expect it'll be fine with 3-4x capacity cells, but not 100% certain.)
Still haven't gotten the reflector assembly apart to see how I can fix the off-center emitter in mine, which was the driving force behind the dismantlement. Yeah, I was in a hurry and didn't think to pick the one with the best-centered emitter.
I
should know better by now...
StarHalo, I suspect the $70 HID beats this in cd/$
, but if I get the emitter lined up over the weekend, you can bet I'll take some lux@10m readings. (I can
just make 10m at a ****-eyed angle through my living room, the hallway, and the spare room.) If "budget" can't be stretched to $70, even for an HID, then I think this has a good shot at it.