Well, I have been running my T10 and P2D off Tenergy "900 mAH" rcr123's. I am not 100% but I am pretty sure you can run these lights off of 3.7v rcr123's as well.
1. Yes, AW does have LiFe PO4 3v rcr123s
here or
here if that doesn't work. I'm sure they are the best ones but I haven't tried them.
2. I have had a good experience with the
Tenergys which I bought from battery junction (Matt is great to work with). I am not sure how they work as they don't seem to be LiFe PO4 but are somehow limited down to 3v nominal (3.2v actual) by some kind of PCB. In any case, I use them in an incan light (underdriven SL twintask 2L) with no probs. I don't really have any other RCRs to compare them to but they seem to last quite long
Only thing I don't like is that according to instructions they can only use the specific charger they come with.
The charger AW sells is able to work with both 3v LiFePO4 and 3.7v Li-ion RCR123s (but probably not the tenergy 900mAH ones).
Personally, I think that since these kind of lights T10, P2D are regulated and multi-level any quality cell will do fine. For ultimate runtime though, probably the AW ones.
