Sorry to harp on but my 7 series runs like sh*t when the battery is low, once fully charged it's a completely different animal, there so much electronics that standing a month without use with or without the alarm on drains it significantly.

Doc, which catch tank did you get in the end?

Thanks,

Matt.

Something like this will do you.

Click for ebay link



FYI dont forget you will need a pipe and bracket as well.