multiblitz
Ok, I tried B, but only with a 33000uF lytic (no supercaps) to start with…
Well…when switching on the batteries, the relais klick and after a second they immediately klick back and let the supply go im charging mode…that happens as well when the cap is precharged.
Now, what I observe is even without the cap: Once charging is done, I can switch on battery and the relais stay, so battery supply works. When I switch it off, even after only one second, the charging immediately starts again.
That was not the case before I started with this experiment…so I guess even with only a cap at the output aomething is broken, either a battery or one of these small three leg devices of each battery where the lanel is near impossible to read…