ah, sorry, did not realize I gave you a link for a backordered item
worth waiting for…
my justifications on using unprotected IMR:
IF my RRT-01 gets noticeably dim between recharges, I take it as a low battery warning. Ive tested that behavior with a voltmeter and it has never been below 3.4v by the time I notice.
I can see the light is about half as bright, and I can tell Im having to turn the dial twice as far to get the expected brightness, when the battery is about half empty.
I feel reasonably safe using unprotected IMR chemistry. I have not had any overdischarge situations, have not left the light on and fallen asleep. I also test my battery voltage regularly, so Ive learned how much typical usage I can get, before needing to recharge.
I love having the 1200mAh cell in the RRT-01… double the capacity of my protected 16340 cells…
a couple more observations of 18350 IMR vs 16340 ICR in my RRT-01
The IMR will give me a maximum lumen output that is double the output I get with an ICR
I also just observed that the IMR flickers on maximum, when the cell is at 3.6v, I can tell the light is trying to go to a higher but the discharge level of the battery cannot maintain the brightness it could with a full charge.