This is not a topic on what is safe for the cells.
The question is: at what voltage do most lights stop operating at their max output?
A lot of people consider the max current draw and capacity of batteries but if the voltage sags below the point where the light will function at max, it seems worthless to me.
By maximum output, do you mean the highest mode? There are really too many variables involved.
What is the max output of the light? What battery are you using?
Say its a XM-L2 at 3A and you have a 3400 Panasonic. Just check some charts. Find the forward voltage of your led at 3A then look at how long till your battery will drop below that.
Cree data sheet.
Match’s tests
So if you have a single XML2 that has a turbo of 3A, you would need the battery to deliver at least 3.3V, right? Is any data available for higher currents?
Match’s XML2 voltage chart goes up to 6A. You will find led datasheets only go up to the max recomended current so for higher currents search for tests by BLF members.
