I have a new armtek predator pro 2.5 that seems to be playing up. When I bought it I also bought a cytac 2400mAh 18650. It has worked OK but recently when I have put it into custom mode it starts off OK for a couple of seconds then drops down to moonlight on both lines. I have the battery fully charged. The light is set to the right battery configuration. Also when this happens I am not able to enter programming mode. With the same cell it is OK in default mode.

When I swap the cells to nitecore rcr123’s then the light plays up for a while, flashes 4 times and then allows me to enter programming.

Anyone had similar experiences, or have any ideas.