Ok, the light worked for the rest of the evening on moon, low and Medium. I did not try turbo.
This morning I did a test of Turbo and after 30 seconds the light stepped down to medium. Battery was a 3.9v and the Utorch battery test gave 2 flashes.
I tried Turbo again, but after 3 seconds the light turned off and would not turn back on. I discovered the battery was at 0 volts, the protection circuit had tripped. I installed a fresh battery, the light works fine.
Charged the battery that was at 0 volts for 1 minute, then took it off charger and measured voltage at 3.9v again. The light works again with that battery.
My present theory is that once the light gets to 3.8v, which corresponds with 1 flash of the battery check mode on the light, it wont maintain Turbo, and repeating attempts to run turbo, can trigger the battery protection circuit.
Conclusion is, dont fire turbo again if the light steps down to low from Turbo after a few seconds, and the battery test flashes 2 times (3.9v) or less.
Next time I cause the light to shut down completely, assume protection is triggered, install a fresh battery.
a pic showing the Utorch with fresh battery working normally, while the other battery is being charged (in a PT16 that has built in USB charging).
note to self, avoid Turbo and Strobe. Stick to Moon, Low, and Medium.
Use the built in battery check, and if it drops to 2 flashes, avoid Turbo and strobe completely.
unable to leave a good thing alone,
I did another test with the fresh charged battery at 4.1v and the Utorch battery level flashing 4 times. Ran Turbo for 75 seconds, on my light meter, and watched the initial brightness drop to 50% (normal stepdown after 1 minute). Turned off the light, the Utorch battery check showed 3 flashes, and the battery tested at 3.98v on my meter. Moon, Low, Medium, all working normally.
moral of the story, Turbo is Not my batteries friend.
Now back to our regularly scheduled Flashing… Happy SunDay!