When a lead acid battery like yours charges it produces a corrosive gas which is vented around the top of the battery filler caps. This gas has attacked your terminal, so first eliminate the corrosion using baking soda and water or coca cola to clean the top of your battery. Next apply either a battery terminal protector available at auto parts stores or you can use axel grease on the terminals to prevent more damage. When you have the battery cleaned up check to make sure there are no cracks on the top especially around the terminal.
When a lead acid battery like yours charges it produces a corrosive gas which is vented around the top of the battery filler caps. This gas has attacked your terminal, so first eliminate the corrosion using baking soda and water or coca cola to clean the top of your battery. Next apply either a battery terminal protector available at auto parts stores or you can use axel grease on the terminals to prevent more damage. When you have the battery cleaned up check to make sure there are no cracks on the top especially around the terminal.