You have corroded battery terminals. Vehicle batteries Possess a good plus a adverse terminal (The 2 terminals you link jumper cables to when bounce-starting off a car or truck). Corrosion about a battery terminal—a powdery buildup that’s usually white, green, or blue—can hamper battery perform. Car or truck Battery Replacement https://dmozbookmark.com/story18111339/fascination-about-car-battery-charger