Others have had a problem with batteries draining on a sleeping Abyss. OG board.
I think @DeloresRose and @charlie1465 both had similar issues.
I had battery drain. I tried it with a few different batteries, one was older (2 years but still working well) and 3-4 new ones (maybe 2 months old, only used a few times). Those batteries functioned just fine in other mods.
I contacted them but have not gotten a replacement nor any promise of one.