Battery stock must be rotated on a “first out” basis; is applicable to WET charged  and DRY charged batteries. Each OUTLAST BATTERY has a serial number attached to it  indicating the month, day and year it was produced. It is important to monitor the code Ex: 11 08 18 

 Months Day Year 

Regularly to serve as reference to battery, freshness. Shelf-life of a brand new battery is  6-8 Months from date of production, if found more than 8 months, battery should not be  sold to customer instead immediately ship back to us for replacement of new stock.