Interesting that you blame the light. I have a few protected ICR that came as part of a trade, and I admit the protection is nice, but I don't buy them because I don't like ICR. I only buy IMR and INR, and I use them in my incans, and incan is mostly what I use. I have murdered several cells in the past, but it hasn't happened for over 2 years. I'm a lot more confident now in my judgement of SoC without checking. It's half having an idea how many minutes are on the cell, half noticing what the light level is. When a cell gets near and below 3.6V, the light level really drops, and that's easier for me to pick up on now, as opposed to before.
This is pretty reasonable. My theory is just that Olight cells are cheap (in contrast to their lights, which seem decent enough). idk, but I would assume they source the cheapest cells they can find.