run time question

I’m looking for some answers on run time for my project , I’m going to be using 1 led at 5.a to 5.5a how much run time will I get if I’m using 3 x18650 batts ?? And same question if I will use 4x18650 cells ?

Assuming the best batteries (3400 mah) and that you have a driver that allows you to use their full capacity:

3.4*3.7=12.58 watts * 3 batteries = 37.74 total watt hours

3.6 volts (estimate on the vf of the LED) * 5 amps = 18 watt draw

37.74/18=2.096666 hours or 2.1 hours

Or with 4 batteries:

3.4*3.7=12.58 watts * 4 batteries = 50.32 total watt hours

3.6 volts (estimate on the vf of the LED) * 5 amps = 18 watt draw

50.32/18=2.795555555 hours or 2.8 hours

Thanks scaru, really not much difference I don’t see my self using it for few min at a time ect……just had to ask so I no what host I want to use