The Hotronic S4 Power Plus Battery Pack is designed for winter sports enthusiasts. Made of durable plastic, the Hotronic S4 Power Plus model is ideal for winter sports like skiing, snowboarding, and ice fishing, ensuring that your feet stay dry and comfortable while on the slopes. The battery pack pictured is the one for sale. There are minimal signs of external wear, this battery pack is in excellent condition. I tested the battery in my ski boots and it powered the hotronic heating element for 6 hrs 45 minutes on setting 3/4, indicating high normal battery capacity (see chart in photos). Charger shown is included.