I know this is a late post but the main body screws can purchased through Fastenal (part # M42510030A20000).. This screw is 1.25" in length vs the .75" factory originals. I feel that the extra length keeps the screw hole threads in better condition versus the shorter screws stopping flush with the back of the aluminum battery housing.
These Lipo's should work:
https://m.banggood.com/4PCS-Eachine...-20C-Lipo-Battery-p-1309948.html?rmmds=search
(You can buy them separately as well / they can be purchased on eBay as well but the price is a little too high for my taste)..
It seems that depending on when you're ESV was purchased, the micro jst plugs may differ a little.. You may have to match them up (Bangood or eBay should have what you need)..
It also looks like we will be left with having to make our own coils.. Stove top coil making techniques can be found on YouTube..
( I liked this one myself):
If anybody knows what gauge wire is being used with a little practice, we probably could take care of these things yourselves.. For something costing 300-plus dollars I would hate to be looking at it sitting on a shelf and it doesn't work..
Also I don't want to give out the wrong information. But for what I have been reading, the battery packs could possibly be revived using the right RC LiPo battery conditioner.. Just a thought..