Hello, need your advice: My brother often travels with his motorhome for a long time. So far he had a garage and a charger with pulse charge, so that the battery was always charged and was available. In the new apartment he has no power connection in the underground garage, therefore he wants – like in his motorhome – to turn 2 batteries in series, so that they last longer. What do you think about it? Is that possible, sensible? Are there any risks? What does the electronics say about it? Thanks for E Your Help Greetings Stronghold