The Battery Charger from Sport Innovations works with the Rechargeable Batteries for your horse's Sport Innovations ProSeries 3 in 1 and MagPro Plus therapy blankets. Although your blanket will come with a charger, extra batteries and chargers are a great way to keep your blanket running through multiple uses on the same day without having to recharge. The chargers and batteries are small enough to be stored away when not in use, and fit nicely in a tack room or lounge, should you choose to create a charging station.