And just to balance everything out, I wouldn't recommend efest as a brand. Although with your Nautilus on your Nemisis, it should be perfectly fine and well within the battery capabilities.
I would recommend AW batteries from
AW IMR 18650 2200 mAh
and
18650 Samsung INR18650-25R 2500mAh High Discharge Flat Top - Batteries - Batteries, Chargers, and PowerPax Carriers <----- Illumination Supply also have the LG HE2 which are another good quality battery.
As well as Sony VTC4 / 5 when bought from the above two vendors (when in stock)
Efest started off on the wrong foot for me, quoting pulse amp ratings, rewrapping other manufacturers batteries and just generally obfuscating facts when asked about their battery capabilities.
Many members use them with no issues, but I struggle to want to give my money to a company that treats its customers in this way.