Purpose of battery cable under passenger side floor

[Ramtruckdriver]

Hey Group, Is anyone familiar about the open end battery cable under the passenger side floor, with the ATMM wiring harness? Appears to be a 10ga battery cable, Curious to see if I can use it for something, if it's fused from battery.
2019 Big Horn crewcab

 

[edrclark]

The e torque battery is back behind the rear passenger seat, maybe it has something to do with that

 

[Edwards]

The subwoofer is on the passenger side with small wiring. The eTorque battery is on the driver's side and I believe the heavy wiring runs under the cab.

No idea why a wire that size is in that location.

 

[22TRX7.0l]

The fact that it’s not terminated correctly has me wondering what it’s for. Maybe the sub if you don’t have one or a mistake. However it should be taped up just because you now know it’s there