I tried my SC53w on 14500 today.

Preliminary results: It works perfectly on 14500! All modes function properly. Max output looks comparable to my SC5wII. My guess is 500 lumens like the SC52w…… that’s a substantial improvement to the 200-300 lumens it outputs on AA.

I also experienced an issue similar to what Msf on CPF Forum experienced. Immediately, after running the light on 14500, the light initially malfunctions when a 1.5v AA is inserted. It starts at the 500 lumen turbo, but then within a couple seconds ramps down to med, then to low, then turns off.

But this problem is not serious. After removing the cell and reinserting, the light stabilizes and starts operating at the normal 200 lumen expected output on AA. It appears to take maybe 15 seconds or so before the light configures itself for AA and starts functioning properly again.

My guess is Zebralight used almost the same driver from the SC52. They probably designed it to support 14500, but experienced the same issue we experienced. The problem might have been caused by different parts used on the driver board compared to the SC52, or maybe it is a programming issue on the MCU. Either way, I suspect rather than fixing it they just decided to drop support for 14500.

I haven’t tried running my SC53w for an extensive period on 14500 yet, but so far it’s looking good. I’m running on a Vapcell button-top 1050 mAh L10 cell. Unlike the SC52w, the SC53w did not work with flat tops.