Hello and welcome to the forum. Glad to have you here!
The batteries you are using in your mech mod are not safe chemistry batteries. You should be using IMR (Li-Mn) or IMR/Hybrid "safe-chemistry" "high-drain" batteries. If you want to be safe, don't use your Samsung batteries in ANY mods.
Below is a blog post Baditude (our resident battery/safety expert):
Battery Basics for Mods: IMR or Protected ICR?
- choose the safest and right battery for your applications here. Includes a list of name brand, high-drain, safe-chemistry batteries with mAh & amp ratings in 18350, 18490/18500, and 18650 sizes
SO based on this^...The one I just posted is on the Baditude approved list. Is it the best one? I don't know...but it should be a safe one. Weird that the mod requires two of them though.
From Bad's Blog.....
"As mod users, we depend heavily upon batteries. To assist novices to choose which battery to use in their mod I have written this guide. Our choices are IMR, protected ICR Li-Ion, and a new class of Hybrid batteries.
High quality IMRs are currently recommended in place of protected ICR Li-Ion for all applications. reference - Rechargeable Batteries
IMR (Li-Mn) are the safest batteries available for vaping. They use safer chemistry, so they don't require a built-in protective circuit like ICRs do. They have higher tolerence to stress, and although they may vent during failure it is less likely to be as dramatic as a ICR. Should protective circuits fail in ICRs they can vent violently in flames and possibly explode. ICR battery explosion
High Quality, Brand Name Batteries. Batteries are not created equal. I recommend buying only the batteries from the list below, paying attention to model numbers:
AW IMR
18650 2000mah 10Amp
18650 1600mah 24A
18490 1100mah 16.5A
18350 700mah 6A
LG18650HE2 2500mah 20A
MNKE IMR
18650 1500mah 20A
26650 3500mah 20A
Panasonic or Orbtronic hybrid
CGR18650CH (IMR/hybrid) 2250mAh 10A
NCR18650BD 3200mAh 10A
NCR18650PF (LiNiCOMnO2) 2900mAh 10A
NCR18650PD (LiNiCoAl) 2900mAh 10A
Orbtronic 18650 SX22 2000mAh 22A
Orbtronic 18650 2500mAh 21A
Orbtronic 18650 SX30 2100mAh 30A
Panasonic 26650 CGR2650A 2650mAh 50A
Samsung hybrid (LiNiCoMnP)
INR18650-22P 2200mAh 10A
INR18650-20R 2000mah 22A
INR18650-25R 2500mAh 20A
Sony hybrid
18650VTC3 1600mAh 30A
18650VTC4 2100mAh 30A
18650VTC5 2600mAh 30A
26650 2600mAh 26A
Efest IMR
18650 2250mAh 10A
18650 2000mAh 10A
18650 1600mAh 30A
18490 1100mah 8.8A
18350 800mah 6.4A
purple 18650 2500mAh 35A* (rebranded LG18650HE2 2500mAh 20 amp*)
purple 18650 2100mAh 30A (rebranded Sony 18650VTC4)
purple 18500 1000mAh 15A
purple 18350 700mAh 10.5A"