That will work fine Dutch. Assume this is just a temporary measure until charge system is sorted though.

BTW exactly 12 volts measured on a battery with engine off equates to one that is holding less than half its full capacity.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone