I went to make a message with my car (Citroen Xsara TD), I took it again after 5 minutes and the battery was downloaded completely. You cannot turn on or lower windows. Something similar happened to me months ago in a parking lot, but I don't know the time it took to happen the same. I remember that then an insurance crane came, connected its battery to recharge that of the clients and the car turned on again. Why does this happen? This time, because of the little it took to download (five minutes, only some little luces of the dashboard are lit and it makes a small noise on the battery, like a tic ... ICT ... ICT ... ICT ... ICT ... When I give it to contact) I do not know if the battery recharge will work again, but I worry more if this download is due to some external factor (magnetic) to the car. Does anyone have an answer?