Heated Jacket Batteries Explained: 5V vs 7V, Runtime, Power Banks

Most people shopping for a replacement battery ask the wrong question. They ask how many milliamp hours they need. The number that actually decides your runtime is watts, and your garment sets that, not the battery. Once you understand the 10-watt ceiling on a 5V system, every runtime claim on every spec sheet becomes something you can check yourself in about fifteen seconds.

This guide covers the two voltage systems ActionHeat uses, what each capacity actually buys you in hours, and when a generic power bank works and when it quietly will not. If you already know your system and just want the right pack, the full range of heated jacket batteries is sorted by voltage and capacity.

• The short answer
• 5V vs 7V: what actually differs
• How long a battery actually lasts
• Capacity math: turning mAh into hours
• Can you use any power bank?
• Which battery for which gear
• Five mistakes that cost you runtime
• What to do next
• Frequently asked questions

The short answer

ActionHeat runs two separate battery systems, and they are not interchangeable.

5V powers jackets, vests, base layers, hoodies and headwear. It is a standard USB output, which is why these garments work with ordinary USB power banks. 7V powers the heated gloves, the heated blanket and the sleeping bag pad. It uses a proprietary connector and a matched charger.

Heated socks are a third case again. They run on 3.7V packs that sit in a cuff pocket, not on either of the above.

Plug a 5V pack into a 7V garment and nothing happens. Plug a 7V pack into a 5V garment and you risk the heating element. Check the garment label before you buy anything.

5V vs 7V: what actually differs

The voltage number is not a warmth rating. It describes the electrical system the garment was built around, and each one is suited to a different job.

The practical consequence is that 5V gear is far more forgiving. Torso garments draw more total power than gloves, so ActionHeat put them on the USB standard where you can carry a spare from any shelf in any airport. Gloves need a small, flat pack that fits a cuff, so they get a dedicated cell.

That flexibility is the whole design argument behind the 5V line. It is also why the heated jackets and heated vests ship with a pack in the box rather than requiring one.

How long a battery actually lasts

Here is what a single 6000mAh pack delivers on a 5V garment. These are the published figures for the ActionHeat 5V half zip pullover, which uses the same 2 amp tri-zone system as the jackets and vests.

Note the shape of that curve. Dropping from high to low does not double your runtime, it slightly more than doubles it. That matters for planning a long day outside, and it is the single biggest lever you have.

Capacity math: turning mAh into hours

You can do this yourself for any pack on the shelf. Three steps.

Step one: convert mAh to watt hours. Lithium polymer cells are rated at 3.7V, so multiply the mAh figure by 3.7 and divide by 1000. A 6000mAh pack is 22.2Wh. ActionHeat prints that number right on the 6000mAh product page, so you can check the conversion.

Step two: find the garment draw. The ActionHeat 5V torso garments are a 2 amp system at 5 volts. That is a 10 watt ceiling on the high setting.

Step three: divide, then take about 10 percent off for conversion loss. 22.2Wh divided by 10W is 2.2 hours. Knock off the loss and you land at roughly two hours, which is exactly what the spec sheet claims. The math holds.

Run the same three steps on the rest of the line and you get a planning table you can trust:

Two honest caveats. Cold weather reduces usable capacity in any lithium cell, so treat these as ceilings on a 20 degree day. And if you charge your phone off the same pack, every watt hour you spend there comes straight out of your heating time.

Can you use any power bank?

On the 5V side, usually yes. The 5V signal technology in ActionHeat garments is built so most standard 5V USB power banks will run them. Three things decide whether a given pack works well.

Output amperage. Read the fine print on the pack. A 5V 1A output will run gloves, socks and headwear. A torso garment wants 5V 2A. Feed a jacket a 1 amp pack and it will heat, but weakly and slowly.

Auto shutoff. Many generic power banks cut power when draw drops below a threshold. A heated garment on low can sit under that threshold, so the pack keeps switching itself off. This is the most common reason a third-party battery seems defective when it is not.

Physical size. The battery pocket is sized for a slim pack. A brick-shaped 20,000mAh unit will not sit flat against your back, and you will feel it all day.

On the 7V side the answer is simply no. The connector is proprietary and the charger is matched to the cell chemistry. Use the 7V pack and the 7V charger that came with the gloves, and nothing else.

Which battery for which gear

Every ActionHeat pack is UL certified. That certification is worth checking on any lithium battery you intend to wear against your body for eight hours.

Five mistakes that cost you runtime

Storing a pack empty. Lithium polymer cells degrade when left at zero. ActionHeat's own battery care guidance is to keep packs at 25 percent or more in the off season. A summer spent flat is the most common cause of a pack that "died after one winter".

Leaving the pack plugged in. Disconnect the battery from the garment when you are not wearing it. A connected pack keeps a small drain going.

Running high the whole time. High is a warm-up setting. Get the garment hot, then drop to medium or low and hold. You will more than double your day.

Charging your phone off the heating pack. It works, and that is the point of the USB output, but budget for it. A phone top-up is roughly an hour of heat.

Buying one pack. A spare in a coat pocket is the difference between two hours and four. It is also the cheapest upgrade in the catalog.

What to do next

Start by confirming the voltage printed on your garment tag. If it says 5V, a 6000mAh pack covers a standard outing and a 15,000mAh pack covers a full shift. If it says 7V, buy the matched 7V kit and nothing else. If you are buying the garment and the battery together, the jackets, vests and base layers already include a 6000mAh pack, so you are shopping for a spare rather than a starter.

ActionHeat has been building heated apparel since 2014, has sold more than 2 million units and stocks gear in over 5,000 retail locations. The battery lineup exists because runtime is the thing people actually call about.

Frequently asked questions

What battery do I need for a heated jacket?

A 5V USB power bank with a 2 amp output. ActionHeat heated jackets, vests and base layers all run on the 5V system, and each ships with a 6000mAh pack that delivers 2+ hours on high and 4.5+ hours on low. If you want a longer day, step up to the 9300mAh or 15,000mAh extended life pack. Do not use a 7V glove battery.

Can you use any battery pack for a heated jacket?

Most standard 5V USB power banks will work, because the garments use 5V signal technology built around the USB standard. Check three things first: the output must be 5V 2A, not 1A, the pack must not have an aggressive auto shutoff that cuts power at low draw, and it must be slim enough to sit flat in the battery pocket. Look for UL certification.

How long will a 10000mAh power bank last on a heated vest?

Roughly three and a half hours on high, closer to seven and a half on low. A 10,000mAh pack holds about 37 watt hours. A 5V vest draws up to 10 watts on high, so 37 divided by 10, minus conversion loss, lands near three and a half hours. Cold weather and phone charging both reduce that figure.

How long does a battery last in a heated jacket?

On the included 6000mAh pack, expect 2+ hours on high at 150°F, 3+ hours on medium at 130°F and 4.5+ hours on low at 110°F. Most people warm up on high for ten minutes and then hold medium or low, which realistically gets a full afternoon out of one charge. A spare pack doubles it.