I took my Black&Decker apart to check the fan, it is the B&D VEC1093DBD 40AMP Smart Mode Charger that Roy Ken posted a picture of early in this thread. Quite a little job to get the case open.
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The fan is working well. I took the center sticker off and noticed the grease in the "bearing" is pretty skimpy so I added a squirt of white lithium. I have a few new computer fans but this one is a little bigger than CPU fans from a few years ago. It is 60 mm square and 20 mm thick. The thickness is critical bit it could be larger in the other dimensions. Where would I find a better quality fan?
It went back together quite easily. Only lost one screw. It is charging a battery right now, with more than 15.5 volts, up to 12 amps. I probably should have disconnected it from the vehicle.