Marty, some of them do come back, others don't. I can't say which as I've put YLB's in a lot of mine, and I'll be installing them in others as the need comes up. 
sinclair posted:And when you do that, please post a how-to and I will follow suit as my VL BB does drop sound in one place sometimes. That and It'd be a good example of how to go about it as I have a couple Legacy locomotives that don't have battery provisions that I want to add to. Maybe a roll your own YLB so it can be split and mounted to fit in odd spaces.
That's not really in the cards, too much work for too little gain. Most tenders will fit the standard YLB, no reason to scatter it around. 
