Corrosion can harm the battery terminals after some time. Greenish residue about the terminals indicates corrosion. Clear the terminals as part of the job of adjusting an auto battery. Most batteries last about two to 4 a long time in hot climates and 4 to six yrs in cooler climates. https://getsocialnetwork.com/story3452486/car-battery-change-no-further-a-mystery