There is a battery shut-off switch under the hood of the 550. I wanted to know if anyone uses this on a regular basis. I only use my 550 on weekends so it sits all week in the garage. Should I use this switch or is it ok to sit for a week? I have a lotus esprit that I have to disengage the battery or it will be dead by the end of the week. However, this is the problem with an esprit, the battery always goes dead.