Is it okay to equalize maintainence free batteries?

Well this is a CONTINENTAL battery, Group 31 and it says on the side EXTREME DUTY XHD-31C. It is a wet cell. It has a telephone number on it 1-800-442-0081. When I called that number it seemed like the guy had a foreign accent and he didn't even seem to know what "equalize" ment? Then he gave me another number to call 414-524-1200. The woman had me on hold so long I gave up. I figured I could get faster service on here. So here I am. Thanks Terry.