Airfield finds – Air Ministry Ref No. Help Please

Hi,

I would like some help please regarding a few items recovered from an airfield some time ago that are so far proving a bit of a mystery in pinning them down to a date and purpose.

First item is a Brass 2 pin plug with 5A/1983 reference number, this item is also stamped with the AM and Kings Crown.
Second item is what resembles an 1154 radio plug but this one has 5 rows of pins rather than the usual 4
Last item is an AM marked battery with part number ADP4 RAF (Battery is quite small overall size is 80 x 90cm) look a bit big for a torch, just as a complete wild guess but did any of the survival kit have batteries?

If anyone can help ID these items I would be very grateful for any help.