The present invention relates to a filling device for filling a reservoir, the filling device comprising a housing configured to hold a container for a liquid a conduit arranged for fluid engagement with the container a drive unit configured to expel a liquid from the container through the conduit and a connector configured to be attachable to a reservoir, wherein the connector comprises at least one contact element the filling device further comprising a trigger assembly arranged to act on the drive unit such that when the trigger assembly is activated the liquid is expelled from the container through the conduit.
