Thing is I am talking about a bike battery here. And a bike that until I put compression releases in needs damn near every bit of the battery it can get....
If it could get to the metal....Electricity takes the path of least resistance. Like was said earlier it isn't going to the metal or concrete through the plastic case. Where is 'the least resistance'? Unless it is hooked up in a circuit, the least resistance path is either between the terminals (through dirt moisture or both) or internally! Gel batteries will have much lower internal discharge than wet cells. So, no matter where you keep it it will go dead if you don't charge it.