Comfort battery emptied by Navi?

Hello to the forum, one before: I used the search function in detail before I published my problem. Can it be that a non-activated navigator pulls the comfort battery empty within 2 days? Abstract: Apparently, my navigator does not always switch off after the P. I described the problem in detail to my friend, because in advance the empty comfort battery took place some stays in the workshop. In the meantime, I leave the lid of the glove compartment slightly open with the help of a support, so that I can recognize the identification light of the Navi even when the vehicle is closed. If the Navi is not switched off, the charger (Cetek MXS 5.0) is connected. Through the friendly, the problem was sent to the TSC in WOB. Since last Tuesday, an employee from Dresden has also been taking care of these Ts. has anyone ever had the necessary experience and can help solve the problem? Greeting from the Near Land