I'm not interested in the politics per se, just thought it makes sense to buy from where I live. We're in a recession, and I support US businesses if possible because I know a lot of people are out of work due to this virus. Apparently that may be difficult or impossible regarding the batteries.
Tried to contact AllCell and got some woman who had trouble w/ English, so no info there. At Dakota, no one answers their phone. Oh well.
I did find these. Reasonable cost, could put 2 or 3 together. Surely made in China, but a US seller, and ships from the US, so that's probably as good as I can find. There were several other US sellers that had this battery too. The charger is crazy expensive though. Amazon wants around $120.
https://www.ebay.com/itm/Metabo-HPT-BSL36B18-36-Volt-18-Volt-Lithium-Ion-4Ah-8Ah-Battery/392847945827?epid=622944176&hash=item5b778ff063:g:s8YAAOSwZmpetVqU