I have bought a lot of wrong batteries.
I had a look to adapters on thingiverse and I find them too complicated.
So I have designed my own adapter. Printing one of them takes about 25 minutes. If I print four adapters at once it takes about one hour.
It have only one non-printed part - a little pease of alluminium foil.
In my opinion the contact hub is better on batterie's minus.