There is an electrical gadget on the back panel next to the thermostat, and
I have an idea it has something to do with the battery but I am not sure.
Could you take a look at the picture

http://i10.photobucket.com/albums/a113/sweetcatkins/Whatisthis.jpg

and give me some insight as to what its purpose is, and how do I use it?

Thanks ever so much,

Ellen & Lola
85 Vanagon ASI

Happiness comes more from loving than being loved; and often when our
affection seems wounded it is only our vanity bleeding.  To love, and to be
hurt often, and to love again -- this is the brave and happy life.
-- J.E. Buckrose