Spare Batteries for Heated Socks, 2 × 4,000 mAh

One battery per sock

The EmberThreads Battery Pair powers our heated socks and heated knee socks. Each sock gets its own battery, which sits in the pocket at the cuff. Both socks already come with one pair – this one is your second set for long days, or a spare.

  • 2 × 4,000 mAh, 3.7 V, 2 A output
  • Charges via USB, cable included
  • Protection against overcharging, overcurrent and short circuits
  • Up to 10 hours with the heated socks or knee socks

Fits

Our heated socks and heated knee-high socks. For the vest, jacket, hoodie and touchscreen gloves, use the EmberThreads 5,000 mAh power bank.

Details and what's in the box

  • Capacity: 2 × 4,000 mAh
  • Voltage: 3.7 V, 2 A output
  • Charging: via USB with the included cable, for example from a USB wall charger
  • In the box: 2 batteries, 1 USB charging cable

Frequently asked questions

Which socks is the pair for?
For our heated socks and knee socks. Both run on 3.7 V and have a pocket at the cuff for one battery each.

Don't the socks already come with batteries?
Yes. You only need this pair as a second set for long days or as a spare.

Can I charge the batteries inside the sock?
No. Take them out of the pocket to charge – and before washing.

Does the pair also fit the vest or jacket?
No. The vest, jacket, hoodie and touchscreen gloves run on the EmberThreads 5,000 mAh power bank.

Shipping is free on every order. Orders usually leave within 1 to 3 business days, and you get a tracking number by email as soon as yours ships.

  • Free shipping, every time
  • 14 days to return it for a full refund of the item price
  • Damaged or wrong item? We make it right at no cost

Read the full shipping policy and refund policy.

Spare Batteries for Heated Socks, 2 × 4,000 mAh

  • Free shipping on every order
  • 14 day money back guarantee
  • Real people reply within 24 hours
  • Safe, encrypted checkout
$74.90$109.90Save $35.00 (31%)

Taxes included · Ships free

In stock, ships now

Tracked deliveryReplies within 24 hours
100% Money Back GuaranteeOrder risk-free: If you don't love it, you get your money back in full.
Battery in the boxEvery heated piece ships ready to wear. No add ons.
Weather readyShell fabrics that shrug off wind and light rain
Made for real wintersTested in damp, wind and long stretches below zero.
Safe checkoutPay with PayPal, Apple Pay or card, fully encrypted.

Made for your days outside

Warmth for every cold weather routine

Built for the everyday hours spent outside in wind, damp air and frost, not just the occasional trip.

Hikes and walks
Hikes and walksShort loops or all day trails
Dog walks
Dog walksEvery morning, whatever the weather
Cycling
CyclingBeat the wind chill from the start
Fishing
FishingEarly mist, cold water, calm hands
On the sidelines
On the sidelinesCheer for hours and stay comfortable
Snow days
Snow daysSlopes, trails, sledding and breaks in between

Common questions

  • Thin heating panels are sewn into each piece and powered by a battery. Depending on the product, that is a pocket power bank, a pair of batteries or a built in cell. Turn it on, pick a level and you are set.

  • Yes. Every heated product ships with the battery it needs, whether that is a power bank, a battery pair or a built in cell. There is nothing extra to buy, and the power banks can also charge your phone.

  • On the lowest setting with the included battery, the vest lasts about eight hours and the gloves five to six. Each product page lists the run time for every level. Bring a spare battery for longer days.

  • Each product page and package includes care instructions. In general, disconnect the battery and cable first and always let it air dry.

  • Shipping is always free. You will see the delivery estimate for your country at checkout and on our shipping page.

  • You have 14 days to send it back. Email support@emberthreadsapparel.store and we will help you set up the return.

Spare Batteries for Heated Socks, 2 × 4,000 mAh

Ready when you are

Order today and stay warm all season

  • Ships free on every order
  • 14 day money back guarantee
  • Safe, encrypted checkout

$74.90

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