If you had a 12v device that came with an Anderson plug and you ran this device with an Anderson plug to alligator clip adapter to jumper leads 2m long to battery so clip to clip to a deep cycle battery would you get much of a voltage/current drop or is there just too many other variables to consider?

Aside from being a dodgy set up, lets pretend that each clip was clean and connected as best as possible, battery in great condition, etc as a general rule would you lose much current with that set up as opposed to a straight Anderson plug to battery source?