COB lights using 4 aaa batteries
Name    200 Lumen LED Super Bright Flip Light
SKU     63922
Battery(s) Included (y/n)   Yes
Battery(s) required     4 AAA
Run time on full charge (hours)     3 hours


ref

Rechargeable AAA cells ...hmm If Energizers
then 

Nominal Voltage: 1.2 Volts
Rated Capacity: 700 mAh at 21°C (70°F)

thus 4.8V  for 4 x NiMH
assuming 700mAh/3h = 233 mA max
some white LEDs can use 2.9 to 3.1V or 3V avg *233mA = 700mW
but 200 lumen / 700mW is very expensive  and not correct
I suspect it only starts at 200 lumens then goes dimmer and fades for the last hour.  



  These are only $1.99 (cheap)


So using more typical specs of decent COB LEDs of 140 Lumens / W     
200 lumens = 1.4W or 466 mA and only lasts 1.5 hr in theory then goes dim 
then it will draw less current for the last part of 3h or my guess the last 1.5h


So I expect 4.8V ~ at &lt; = 330 mA is what I compute or 1.5W @ 133 lumens per watt.

What do you want for 2 bucks?