Used, tested, genuine Black and Decker battery charger part number ETPCA-P360080U for 36V lawn mower models:
CM1936;
SPCM1936; and
Maybe more models as well.
Good overall condition. Take special note that because of Black & Decker's design, it is often difficult with this battery model and charger to connect both together. As such, I removed one small piece on one side of the charger's green connection plug to make insertion easier. See photos. As a result, I believe it works better.
I also have genuine Black & Decker OEM 36V battery housings that you can no longer find in the marketplace. Ask me for details.