Hi guys whats the next size up from a rcr123 ? i've got a solarforce l2m ( the mini one) but i dont like the switch that comes with it so i got a normal clickie one but the battery doesn't make contact.. i'm using a magnet for now but would prefer a better option.
18350 will definitely fit. It is longer than the Solarforce 16340. Both are in front of me. Fits L2m like a glove. Also it is higher than stated capacity (it is nearly 1000mAh) and able to do nearly 3 amps with the direct drive P60s. I don't see how even AW IMR can win this one.
How about one of the plastic battery tube plugs from an Ultrafire 501/502? Failing that a plastic disc with a pop-rivet in the centre should do the trick nicely.
The unprotected flattop cells should be 34mm (just as 18650's need to be 65mm to be within spec for whatever they're placed in, real commercial designs, not dodgy flashlights). The flamefires for example are ~36-37mm since protection circuit is 2-3mm.