In case you are trying to decide between the SC5 and the H53...
I just got good news from ZL's spokeswoman: the H53c will use a spring on the tailcap, not pogo-pins.
The reason why this matters to me is that the spring in the H52 allows you to feed it on AAA cells without any modifications or spacers.
And the H53c will work the same way. That's several billion more cells that it can make light from, just by dropping it in and screwing down the cap.
I don't want to rehearse the issue of springs vs. pogo-pins in the other ZL lights. When it comes to the SC600 series, I think there are good arguments on both sides. But with the 18650 cell, there is no other cell of a similar length that you could use if the light had springs in place of the pins. So the use of pogo-pins does not immediately lose out on the handy versatility of feeding multiple cell-sizes.
In the AA format, on the other hand, the ability to use AAAs is a huge benefit (even if they don't support the highest output levels, or not for long). So in that case, it seems to me that the case for preferring springs to pins is much stronger.
My guess is that the H53c will not support the same high output that the SC5C will. instead of 475 on H1, they may have it throttled back to 300 or so (though it does say "brighter" than before, and the H52 was 300 on a regular AA). But since the new H53c will not support 14500s anymore, I suspect they will be using the same circuitry in the H53c that they use in the SC5c.
Anyhow--I don't want to stop anyone from buying an SC5c. But I *know* that I will be buying an H53c. Pre-orders in a week or so.