Oops!
Current draw is not as low as I reported before. I was only measuring from one of the 2 batteries, so you have to double it for accurate numbers:
9.6 amps, not 4.8. (I edited the previous post.)
Also, looks like the mower is at least 13 years old, since it was built at the local Black and Decker plant which closed in 1998 (source:
Stephen Covey, 55 - Brockville Recorder and Times - Ontario, CA )