You can get them for $5 from liionwhoesale.com so I suppose you could buy as many as you want and glue them together lol. Then maybe use a powered USB hub to connect them all at once.
My plan is to 3D-print a battery "dummy" to insert into the charger, and then use copper tape on the poles to connect to female banana jacks to connect to the magnetic cables, that way I will be able to charge any sized batteries (ok, up to 50cm in lenght or so ;-)) and even better, charge them inside LiPo antifire asbestos bag for maximum charging safety. And with all the MC3000 goodness taking care of the process.
The charger and cables and LiPo anti-fire bags are still on their way to me, tho.
Thanks for the link, really appreciated! This is exactly what I was thinking about, very glad to see you did it already, so now (a) I know it works, and (b) I don't have to start from scratch.
I will look for a local for-hire 3D printer so I can manufacture that, thanks again!