How much current draws your Nichia? I measured 1,57A with thin standards probes off my multimeter. Can you measure yours? (A clamp meter would be better, the leads off the multimeter can result in a to low amp reading)
What I tried:
I tried to trigger Under voltage Protection.
But normally the thermal protection of the lamp kicks in. I had step downs from high/turbo to low after multiple times running high.
With a full battery I need 3 times High for about one minute (the Utorch stepps back if to hot or dimms slowly down after 40 seconds. You will see a step down but you won’t notice the dimming) to heat it up. From that on the thermal protection of the lamp kicked in and it switched to low.
So after every 40 seconds I kicked it back to high, when it steped to low. I lost count on this, but I did this ca. 12 times.
Checked Battery 3.3V, let the lamp cool down, to be shure the step down is not thermal related.
I could run High, after 40 sec it switched to low = seems a standard after 3.6V and no thermal reason
From there on I let it run on Mid with 100lm while writing this LVP triggerd, Battery had 0V
I plugged USB in for 5 sec (to reset the protection) and it had 2.96V
With this I could trigger High. I switched it immediately OFF and read 2.95V
Resting the battery let it reach 3.04V (Edit: I didn’t charged it), tried High and after 2 seconds low voltage protection from the battery kicked in.
0V on the battery measured.
Resting for 15 min, only reseted circuit (Edit: I didn’t charged it): Battery recovered to 3.06V. High for only 2 sec, then LVP
Result:
I could run 15 to 18 times HIGH for about 40 to 60 seconds.
Somewhere below 2.95V LVP off the battery kicked in.
Don’t know what your lamp has.
It could be your Nichia draws more Amps.
There are tolerances of the protection circuit in the battery.
Could it be thermal instead of LVP? I don’t know if you must also reset a thermal trigger with a charger.
Joe