"Hackers" historically developed such a depth of understanding of some system that it allowed them to modify and subvert the system to suit their needs. The people here who have built power systems for Battlebots and are familiar with the variability in specifications for 18650 cells and are saying that this isn't a good idea for reason X, Y, and Z, those people are the hackers.
The people that are saying, "a battery's a battery, I'll just put it in a shed" are dabblers. They don't understand the technology well enough to do it safely, so they just build it with the assumption that it's going to go FOOF someday.
The people that are saying, "a battery's a battery, I'll just put it in a shed" are dabblers. They don't understand the technology well enough to do it safely, so they just build it with the assumption that it's going to go FOOF someday.