This is usually the result of product not properly maintained at the retail store. Each pack is marked with a unique ID #. This ID# is used for quality control as well as notating when the Power Pack was manufactured. Enouvation maintains a record of when a pack was shipped, and to which retailer. Power Packs are not shipped with a full charge for best safety practices. As such, each pack should receive its first charge out of the box per the below guidelines:
E2- within 6 months
E4- within 9 months
E6- within 12 months
E10- within 12 months