I was talking for 3.7V li-ion batteries . Both protected and unprotected batteries will act the same in the light (LVP wise speaking) , protected batteries protection usually kicks in @ 2.5V .
When using an eneloop charged to 1.405V, my UT01 works great. When the voltage drops to 1.295V, the light starts to act weird. Sometimes it will turn on normally, sometimes I have to click two or more times to turn it on, other times it doesn’t turn on at all. Once it turns on, it works normally.
Put another eneloop in. Ran it on high until it dimmed. Now it won’t get any brighter than medium. Turned off and it won’t turn back on again. Voltage is 1.1V. Is LVP kicking in? Shouldn’t it do that at 1.0V?
FWIW… I just depleted a 2000 mah eneloop on Turbo. Didn’t actually time it, but it was in the vicinity of 45 minutes. Right around ~1V output dropped down to one of the low modes. I am not sure exactly which one but it was around 50 Lumens and i think its similar to my second lowest programmed mode. Pressing the button at this point only cycled between 50L low and firefly. I could turn the light on and off, but turning it back on at this point only presented two modes… firefly and the 50L.
Removed the cell and measured it immediately at a comfortable .95V.
Not getting any brighter than ~medium sounds like the LVP doing its thing…. at least thats what mine does.
Mine at that point will turn on and off however.
I am guessing there is a tolerance or window for the circuit, so the actual voltage level may vary from light to light. 1.1V - 1.0V might be within range for the LVP.
It sounds to me like you just have an over-protective LV circuit.
I have some 5A tints in other 1xAA lights (emitters that I got from Intl-Outdoors), and these ‘alleged’ 3D UT01’s are remarkably close - which is fine by me. :+1:
I have Astrolux S1 3D (neutral white), the tint of which I like.
Comparing the UT01 neutral white (supposedly “3D” tint), this is a much warmer — in fact I compared it with a Convoy S2+ (XM-L2 T6-4C tint), and the two tints are closer to each other, or the UT01 “3D” could even be very slightly warmer…