The DVR station meant for the newer Archos 5 and 7 is incompatible with the Archos 605 (I own both the 605 and the 5).

I just bought a refurbed DVR station for my 605 from (competitor) for $57 shipped.  Comes with cables, power supply, remote, and the station itself.

It is my understanding that the DVR station WILL NOT allow the 605 to function if the battery is shot.