Tracking Collar magnets to shut the collars off are always an item being lost. Too many hunters take them out of the collars as the dogs are on the tail gate and chuck them on the inside of the truck bed. BAD idea, because any impact can internally fracture the magnet and it will loss it's magnetism. Not the entire magnet, just the spot that was fractured. Always check to see that your magnets are in good working condition. They will effect the life of your battery. Where do you keep them? A plastic cup holder in the cab of your truck would be our suggestion.