That was probably about jumper cables, but jumper cables can’t move power from battery to battery, only from alternator/solar panel/reactor to battery or from battery to part that consumes energy.
You can also charge car batteries using the “battery” item, but that’s very inefficient because car battery energy is much “cheaper” than item batteries.[/quote]
…why were jumper cables changed to such a thing instead of acting like their real world counterparts?