As a general rule I won't use efest in a flashlight.
Efest uses the batteries from Samsung, lg and Sony that didn't make the cut. Then rewrap and sell them as efest cells.
All I would advise anyone to use are Sony, Samsung or lgs. Especially in multiple battery mods.
Not trying to scare you, but it's best to have all the information available.
This is the results on that battery from mooch, assuming it's the efest 3500 mAh 18650
https://www.e-cigarette-forum.com/f...ts-just-another-rewrapped-10a-battery.736533/
"Bottom Line
This Efest is a rewrap, identical in appearance and performance to the Panasonic 10A/3300mAh NCR18650GA. Both the Efest's current and capacity ratings are exaggerated. At 20A continuous this cell gets hot enough to boil water, 111°C. I am giving it a 12A/3300mAh rating since at 10A it runs cooler than the average temperature for a cell at its continuous discharge rating."
Based on what he is saying, I would never use that battery ...ever. I would order a pair of good Sony vtc5a's
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