Provides high output faster and longer than conventional batteries, resulting in greater cranking ability and constant performance quality as they are discharging - even at high current loads. Optima batteries last 1 1/2 to 2 times longer than conventional batteries. Completely sealed. Does not require special charging equipment. Low self-discharge rate, can sit unused for 8-12 months without recharge. Post/terminal: dual, SAE & 5/16" stainless stud. 12 volt. Blue top.