S-PACK 1200 POWERSOCK BATTERIES
"The S-Pack 1200 is the most common battery used by our customers, making it the most popular among thousands of winter sports enthusiasts.
-Warm feet for up to 14 hours
-Pack comes with a USB charger
-Wall charger not supplied
-S-Pack batteries are suitable for use with the Therm-ic PowerSocks heated socks"