Over time corrosion accumulates on the battery posts and terminals to the degree that this build-up begins to drain power from the battery. That's one of the reasons battery failure is the #1 culprit for calls made requesting roadside assistance.
A battery cleaner and leak detector is applied after a thorough cleaning and inspection. Anti-corrosion BG Battery Terminal Protectors are installed and the battery posts, terminals and case are sealed.
After this service you'll notice: