Wot 'e said ^^^
If all the connections are OK and the wire of the Anderson to Clip Adapter is of suitable gauge for the load I would expect less than 0.1 volt drop and negligible change to current flow at the connectors.
Replacing the battery clips with ring terminals or whatever to "permanently" connect the adapter to the Battery will have pretty much the same issues anyway.
Quick check of voltage with whatever it is you have connected running so the wiring is under load will soon tell you.
If the Bat +ve / Bat -ve voltage is the same or within 0.1 volt of the plug voltage at the pins of the last Anderson or the appliance plug (whichever you can get at from the back the easiest) then all is tickety boo.
If it is slightly worse than 0.1, say 0.2 or maybe even 0.3 lower at the appliance plug that will prob be OK if the load is pulling a fair few amps.
More than 0.2 volts drop under load solely across the 2 metre adapter and andersons would be an issue I would want to fix if it was mine