Prior to me finding this forum I ordered a couple of Ultrafire 18650 XSL 2600mah Protected Button Top Rechargeable Lithium Battery Li-Ion for a mechanical mod. I just received them yesterday but am hesitant to use them now because of all the negative stories I've read here about *fire anything. I don't plan on going sub-ohm with the coils, but rather stay between the 1-1.5 range for a dual coil wrap in a Nimbus. It also sounds like dual coil stresses a battery out in addition to falling below the 1 ohm mark. Should I try sell these batteries and not even waste my time with them?