The E4 Power Pack from Enouvation with patents pending, offers you the ability to CUT THE CORD on Power Motion furniture. This gives you the ability to float a Power Motion piece of furniture without having to see those unsightly, industrial cords. The E4 will give your Sofa with Power Headrests approximately 400 cycles and Recliner 800 cycles before having to recharge. Enouvation Power Packs are tested to multiple UL standards and certified, having gone through rigorous testing. They are the most efficient battery in the marketplace with more power at a fraction of the size. Each Power Pack comes with its own charger in box.