Hello, my 11 he is a pure summer car. Today I wanted to start it and the battery is flat again… Last week it was like that, charged and with running engine 14 volts are on.The battery came in last autumn (Varta blue dynamic, i.e. nothing from the hardware store).A battery breaker is installed on the ground and yet the juice is down to 11,98 volts… does anyone have any idea???As said, if he stands in the garage over the week the contact switch is separated! zzdem somewhere juice flow with separate battery???