Prüfstern Consumer Test 2025

Our products were tested by the independent Prüfstern GmbH and awarded an overall rating of "Very Good (1.3)." This result confirms the high quality, durability, and reliability of our products.

1 8
Jess and 10,000+ other people have shopped with us this year

Power Bank Pair for Heated Socks — 3.7V / 2A, 2×4,000 mAh

Power Bank Pair for Heated Socks — 3.7V / 2A, 2×4,000 mAh

$72.00
$82.00 $72.00
- 12% Sale Sold out
You save a total of $10.00
Reliable warmth for your heated socks — compact battery pack pair (2×4,000 mAh) with stable 3.7V/2A output per pack.
  • ✔ Ultra-compact & lightweight: fits the battery pocket — barely noticeable
  • ✔ Pair system: one battery per sock for even warmth for hours
  • ✔ Safe & certified: CE/FCC/RoHS; protection against overcharge, overcurrent, and short circuit
  • ✔ Easy USB charging: 5V/1A, charging cable included
High Demand – Last Limited Edition

Product description

Double the energy for warm feet: The specialized battery pack set.

This set consists of two compact and robust power packs, each with a capacity of 4,000 mAh. They have been developed specifically for operating heated clothing that requires a 3.7 V system (such as many types of heated socks).

Thanks to their small design, the batteries fit unobtrusively into the designated pockets of your clothing and reliably provide energy for long-lasting warmth. Ideal for winter walks, working outdoors, skiing, or any other outdoor activity in freezing temperatures.

Important Note: These batteries are designed exclusively for compatible gear with a 3.7 V system. Please check the voltage requirements of your equipment before use.

Details

Technical Details

  • Capacity: 4,000 mAh per battery (3.7 V nominal)(Total set capacity: 8,000 mAh)
  • Input (Charging the battery): 5 V / 1 A (via USB charging cable)
  • Output (Operating the clothing): 3.7 V / up to 2 A DC
  • Connector: Specific connector for compatible 3.7 V heated products
  • Safety & Certificates: CE, FCC, RoHS

Scope of Delivery

  • 2× Battery Pack (4,000 mAh each)
  • 1× USB Charging Cable (for charging the batteries)

Safety Instructions

  • Use only with compatible 3.7 V heated products (e.g., our heated socks).
  • The batteries must be removed from the clothing before washing.
  • Never charge the batteries while they are inside the clothing or being worn.
  • Protect from wetness and moisture.
  • Use a USB power adapter that delivers 5 V / 1 A for charging.
View full details

More Runtime for Warm Feet


Two 4,000 mAh batteries deliver constant 3.7V warmth for your heated socks. Simply charge via USB, CE/FCC/RoHS certified, compact and lightweight.

What Is the Naturwide Guarantee? 🌿

Since the founding of Naturwide, quality, functionality, and customer satisfaction have been our top priorities. Our outdoor products are designed to help you get the most out of your adventures – reliable, durable, and practical.

With a customer satisfaction rate of 94.2% and countless 5-star reviews, we are fully committed to providing you with high-quality gear that supports and excites you on your journeys. That’s why we offer a no-questions-asked 14-day satisfaction or money-back guarantee.

1 30

More Space for Shared Adventures? 🏕️✨Then our double sleeping pad is just perfect for you.

View full details

Our Story – How Naturwide Was Born

We are Andrew & Brian, two passionate outdoor enthusiasts who have long seen nature as a space for escape and adventure. But one thing always bothered us: many outdoor products are either overpriced, poor in quality, or just not well thought out.

Read more about us →

Perfect Addition for Your Next Adventure!

1 25
View all

Customer Reviews

Overall rating: 4.3 / 5 from 20 reviews.

We eventually figured it out however my feedback is the battery packs need to come with some basic instructions. Or at a minimum include basic “how to operate” instructions on your website page. Thank you

Scott D. 4/5 Verified

Power Bank Pair for Heated Socks — 3.7V / 2A, 2×4,000 mAh

They work really well and warm your feet really well, but are really big and kind of heavy. I didn't realize that when ordering them for my heated socks, so just a heads up there when you are ordering.

Emily D. 3/5 Verified

Power Bank Pair for Heated Socks — 3.7V / 2A, 2×4,000 mAh

They are just batteries. Not much to love or hate on this one. I do wish that they would come with the heated socks I bought since the socks only work with a battery. Nonetheless the socks work great. The batteries do their job.

Kenton O. 3/5 Verified

Power Bank Pair for Heated Socks — 3.7V / 2A, 2×4,000 mAh