Batteries that are empty and not charged for a long time will shorten the life of the battery causing you to replace it sooner than necessary which can be expensive. This battery cutoff blade type switch allows you to eliminate any unwanted parasitic power draw from the battery when the RV, Camper, Boat, Car, ATV, Marine or Truck isn’t being used. This battery knife disconnect switch turns on and off by just lifting the lever up or down and can be installed in seconds. Great for almost all disconnect purposes you can think of for Marine, Automotive and Campers. If your vehicle, boat or camper is suffering from parasitic power draws then this will solve your issue; fast and cheap.