I don’t have any protected 18350, but they should have no trouble fitting.
The 18350 that the new 2020 RRT-01 and –03 comes with, includes a built-in USB port and charging circuit. It’s much longer than my Aspire 1100 mAh 18350 and is probably longer than any protected 18350 cell.
The overall light is pretty big for an 18350 light. Especially so for the RRT-01 which is slightly longer than the RRT-03 due to the longer reflector. In 18350 configuration the new RRT-01 is about the same size as an FW3A with 18650 tube.
My first-gen RRT01 will run on AA/NiMh voltage, however I don’t have any body tube that supports that size cell. Maybe one can be adapted from another Jetbeam light.
I think you would need to buy the two extenders from one of the vendors, there is no actual 18650 tube
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there is no Low Voltage Shutoff in the RRT-01 driver, and no thermal step down
a responsible user can manage unprotected cells, by observing when output gets dim, or starts to flicker, and/or by checking voltage manually. But if Granni falls asleep with the light on, it IS possible to overdischarge. So give Granni eneloops
It is also possible to damage an RRT-01 by tailstanding it on maximum, using LiIon. So, dont tailstand on maximum, as there is no thermal protection.
this is what my original 2012 RRT-01 does when voltage goes below 2.5v (by which time max output is less than 15 lumens):
I wonder who will be first to test the 2020 maximum output with AA Eneloop?
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review says 18350 protected does work in the 2019 model…
(vinh also reported that protected 18350 works in the 2019 RRT-01):
Thank you for this valuable info! I had no idea that the RRT03 would lack infinitely variable control. Only 3 steps and the lowest isn’t moonlight? That’s a deal breaker for me. I can’t see what use there would be with this light, as it’s primarily a task light (RRT-01 has been that, due to infinite variable). Might as well get an Emisar D4SV2, as it implements the aux LED’s much better.