I did try seaching, but only found a few threads mentioning certain rcr123's don't fit in passing. Maybe a sticky would be a good idea, eg. have a list of batteries and what torches they are compatible with. I know there is a similar problem with the golston rechargable version.
Anyway, my working unprotected cells are the purple 800mah ones from DAE. I also have tried AW's older cells, with the wrapper removed and electrical tape on there to stop shorting, but they didn't fit. I have also tried the battery station ones (from lighthound), and they also do not fit.
I want protected rxr123's, as I don't want to kill any unprotected ones. Even below 3v, the l1t head give out a lot of light so it will be hard to see dimming. I would be happy using unprotecteds if there a way of putting a low-vltage cut-off circuit in somehow... I will have to look into this.
I think Kippers suggestion would be the best. The runtime should be longer with a 3v cell, and 900mah sound like it's one of the better cells. The only thing is battery station charge a small fortune to ship to the UK, but I do know of another source that sells tenergy batteries.
Anyone else tried any other brands? It would be nice to use a rechargeable without stipping the wrapper off.