I have about 7 batteries in the garage, 4 marine deep cycle and 3 auto
batts. About once a month or when I am not too lazy or forgetful whichever
comes first I put them on a trickle charger overnight. I have had the auto
battiers for about a year now and the marine batts over two years. All still
goin strong.

Not sure about the myth but I think that I have heard from a friend of a
friends cousins mother in law that that will not discharge, but I still keep
my batts on a wooden shelf..

Searcher1