Leggy woken up from Sleeping Beauty sleep…

A hearty Moin Moin men! Well, I have a huge problem and a lapalia…. To the huge Prob: My Leggy has been out for 2 months and doesn’t seem to be quite dense…. the water already ran down the windows from the inside. I have clappy seats and some mold on the floor mats… Can I do anything else except always ride with full heating? Is it bad with other possibilities in the weather… dehumidifier or something? The other thing is: It has been standing since April last year, the battery was unloaded for quite a long time. It only starts with a start-up aid. After 30km drive and engine off, I can immediately get the cables out of the trunk. The battery is only a little over a year old. How likely is it that it is scrap metal? Can not drive itself at the moment because the FS was removed. That’s why I first registered it that it is not completely broken and at least every few days In case of cases: Can i recommend a battery? Thought of Bosch or Varta. Mfg