Interstate Battery goes by each retailer once a week or month depending on the drivers route. They PULL older batteries and replace with fresh batteries. They then sell those batteries as rebuilds at a reduced cost at the main warehouse or if a dealer has a customer that wants a cheaper battery with less warranty. There is a melted on code on almost all batteries that designate the born on date. This is because it is the most accurate way of determining the actual date. Some customers like to NOT punch out the month/year dots and then years later when they have a problem they then punch out the date that would give them the most warranty. BUT, Interstate goes by the melted on date since they DO pull batteries as stated at the beginning of this post. Doug