"Ken Weitzel" wrote in message
newsV3if.626987$1i.290049@pd7tw2no...

Another possibility? Possible since it's "medium old", the batteries
have reached that point where they can deliver susfficient current to
spin the motor unloaded, but not enough under load...

Certainly possible, and the most likely answer, but I assumed the fault was
evident on both batteries and mains.

Quick and dirty test for that would be (again) to carefully touch
some moving part with the foil off; see how easy it is to stall it.


That could also indicate a weak motor or seized components. If it's like my
old Braun shaver it has a built in SMPS and intelligent charging circuit,
there could also be a fault there.

Dave