The Rechargeable Battery from Sport Innovations comes with your Sport Innovations blanket purchase and can be used with the ProSeries 3 in 1 and MagPro Plus blankets for your horse. Extra batteries are a great investment if you're treating multiple horses with your therapy equipment daily and don't want to wait for the battery to recharge in between uses. Extra Battery Charges are also available for purchase, and make your therapy treatments seamless throughout the day, you'll always have a battery ready to use.