could this be a message-module?
when I push the A-contact it shows blinking A A A and then blinking A A.
Ive never seen a Hughes with those contacts in the battery compartment either,is it some kind of later modification?
Drop a note if you have any info
BTW:The plate for the A-contact was put there by yours truly,it wasnt there when I found it,must have fallen off somewhere in time.