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
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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
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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.
Technical characteristics
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Heating time
Up to 23h
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Connected
Yes
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Charging time
5h
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Type
Batteries & heating accessories
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Activities
Winter sports
Maintenance
- Store batteries in a cool place (5°/41°F to 20°/68°F)
- Batteries should be half charged before storage
- Charge and discharge the battery regularly
- Disconnect batteries from socks before storage/cleaning
- Clean the batteries with a soft cloth
User Manual
