“Extra” battery cable… what’s it for ?

Yesterday I replaced the battery in my 2012 Sportsman 500 HO. Thought I was paying attention to details, but when I get the new batt in the holder and go to connect the cables, I see there is an extra, large red cable with an end that appears that it could be connected to the + battery terminal. I’m 99 % sure this cable was not connected to the battery, and the machine starts and runs fine and lights work. Also, this extra cable is not bent and formed as if it were connected to the battery. It appears to be left under the seat for some "optional use".

Any ideas ?

“Extra” battery cable… what’s it for ?

Yesterday I replaced the battery in my 2012 Sportsman 500 HO. Thought I was paying attention to details, but when I get the new batt in the holder and go to connect the cables, I see there is an extra, large red cable with an end that appears that it could be connected to the + battery terminal. I’m 99 % sure this cable was not connected to the battery, and the machine starts and runs fine and lights work. Also, this extra cable is not bent and formed as if it were connected to the battery. It appears to be left under the seat for some "optional use".

Any ideas ?