I have had my trustfire flame 14500's from DX for a while now. I have used these batteries in the sk68 tomtop light, for about 3 cycles now. I tested the runtime on the sk68, and got 50 minutes until the lights went out, without dimming. The protection on these batteries seems to be what's tripping, and they trip at 3v. Having said that, the XTAR WP6II charger charges these 14500's in @90 minutes, the finished voltage is 4.19v each.
There is a trick to resetting the battery protection of the 14500's using the wp6II. If you simply put the 14500 in the slot using the supplied spacers, the batteries will not begin charging. However, if you put the 14500's in a slot, touch the negative end to the negative spring, and touch the postive end to the positive charging connection with a metal object (I used a chrome plated socket to fill the gap), then the protection circuit in the battery will reset, and you can then finish charging the 14500's normally, using the supplied spacers.
I'm guessing the spacers are not as conductive as the chrome plated socket, and thus will not reset the protection chip.