Updating. post specs and info soon.... Due to mock scr, I had to use unmodified PNP and NPN... Its working but scr is not, so momentary of push button is little useless unless using 40A spst switch to cut a full battery off the charger.
Comment please I got old unused 2n5064 its closest to new EC103D out there.
Using voltmeter and ammeter to monitor charging is strongly advised.
