Did you try emailing him? It looks like the WEB site is still up.
Fred Stevens K2FRD <email@example.com> wrote:
In the October 2005 QST, such a battery extender made by a Phoenix,
AZ ham was reviewed and the price was acceptable, but so many hams
wanted to buy one, the ham was swamped with orders, so he quit making
them. I have not heard of any other controllers which would work for
ham radio except, perhaps one made by Xantrex for its Trace line
which may or may not have had RFI problems.
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