Wahl is still selling their battery powered soldering
iron. I used to own one of those until the nicad's
went bad. They're in Sterling Ill.
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I am using a Wahl battery powered soldering iron since the 1980s
However the battery charger is rather crude ;just a transformer with an
embedded diode.
I have changed the charging circuit by using a 12V transformer
,rectifier and an LM317 and a switch enabling charging at 300 mA (when
soldering iron is in use)and 10 mA (permanently) when iron is not in use.

Frank KN6WH (GM0CSZ temporarily in California)