Battery output versus light output

LED Flashlights – General Info 18650 Flashlights
1

Hi,
If the batteries I am using are not capable of putting out enough amps with my Fandyfire UV-S5(skyray king), this will reduce output, but how do I know if the cells are capable or not, currently it’s running on 3 X AW, and 1 X Trustfire,
thanks
tabs

2

?

You are mixing 3xAW with 1xTF???

3

Yes, have done for years, all start as fully charged.