waeco raps power drain

I noticed when reconnecting the aux battery that there seemed to be some power being drawn through the wiring going to the back of the vehicle even though nothing was plugged in or on.

Checking it with the amp meter, 100ma (0.1 Amp) was being drawn off.
Turns out that the waeco raps 12r-u2 power socket (hella & standard) is drawing the 100ma without anything plugged in.

When it is first connected to power it makes a sound like a relay.

Does anyone know whether it does have a relay and whether it is acceptable to be constantly drawing 100 ma.

I sometimes don't use the vehicle for a week or so, so even though 100ma doesn't seem like much, I expect that it would result in a few amp hours out of the battery over a week or so?

Dan