Hello all, hope summer is treating everyone well. I just replaced my RH battery, while the LH AGM battery had been replaced several months earlier. At some point both batteries died. So I went ahead and bought a new VW RH spec battery, installed it, but dash lit up with a brake fault and won’t start. Do I need to charge the LHS battery? Can this be done without removing it? I have an intelligent charger I can use, but from experience, I know if the battery is drained that would not be of use. The other issue I have is the key stays in the ignition after any attempt to start it. Can I jump start the car with a new RH battery just installed in hopes the the LH AGM battery revives? Any thoughts suggestion would be helpful.