The S-Pack 4000B battery has a maximum autonomy of 23 hours and is controllable via your smartphone thanks to Bluetooth technology. It has three different intensity levels, allowing the user to adjust the level of heat to suit their needs. It can be recharged using the included USB-C charger.

Their robust design is splash- and dust-resistant, whilst their press-stud fastenings ensure a secure fit over Therm-ic heated socks. The USB-C port allows for quick and convenient charging, ideal for getting back out on your adventures in no time.

Easily adaptable to compatible heated socks to provide constant heating during winter outdoor activities.

In a nutshell

• Sold individually
  
• Controllable via Bluetooth on your smartphone with our Heat Control App.
• Heating time level 1: up to 23 hours
• Heating time level 2: up to 10 hours
• Heating time level 3: up to 7 hours
• Charging cable not included
  

Compatible heated socks

The S-Pack 4000B battery is designed to be used with our Therm-ic heated ski and outdoor socks with S.E.T.® or Fusion technology.