I’ve been following this thread here and there for a while. I feel it’s necessary to say @Josh_Cook is the hero we’ve all been waiting for. 
I, and as it appears many of the rest of us, will throw money at you for the battery case. Keep going and the hard work is appreciated! 
Just wanted to also add that if @Josh_Cook does make the battery case and external enclosure for old monitors, I am all in! I think the existence of these options will also create a market for just the parts on eBay and other marketplaces. Right now, without other options I think some of these old parts either sit around in people’s homes or in the case of the batteries I can see how they might end up recycled prematurely. I for one have held off on the upgrades because of this!