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Because I’m cheap, I recycled the circuit board from a craftsman jump box to make a homemade battery tender.
The internal battery died, so I took it apart and removed the circuit board. I had to remove and rewire some of it to remove the 120volt inverter and air compressor functions.
I then mounted the circuit board into a school pencil box, mounted it to the wall, and made a long harness with a series 150 metri pack plug. My Olds has a matching plug permanently mounted under hood, I have another plug with alligator clips for other applications.
Since I save transformers from old appliances, I found one that was rated at 18 volts to power the homemade tender. It’s been in the garage for probably 10 years. Works great.