As previously posted my 1975 Eldo Bitza's alternator went wacko and toasted my battery. It says Nippon Denso ND 100211-1680 on the label and the nice man at DB Electronics put me on to this no-name knock off:
Bonus points for being a part from an actual tractor. I sent the link and a photo to Greg Bender so he can update his site.
Bike is back together and charging properly. Note frozen pond in background. There was ice here and there but temps hit 50F here in the Hudson Valley of NY.