One battery. One charger. One habit that carries you from January to December. The EarthBae 7.4V battery is the power standard behind every powered piece EarthBae makes, and it is the reason a single charge on your shelf covers both the cold months and the hot ones.

This guide explains what the standard is, which products run on it, everything it can do across a real year, who uses it, how long it lasts on a charge, how long it lasts over its life, and what happens to it when it is finally done.

There is a bigger idea underneath it.

Active Thermal Regulation is a new category: apparel that adds heat when you are cold and removes it when you are hot, built as one connected ecosystem rather than as separate seasonal products.

A shared battery is the piece of infrastructure that lets heating and cooling run on the same power, charge the same way, and live in the same wardrobe, and it is a core reason EarthBae is one of the first brands building thermal regulation as a single category. 

How Does the EarthBae Battery System Work?

EarthBae heated and cooling apparel runs on USB Type-A power. The garment connects to the battery through a Type-A plug that sits in an interior pocket, and the battery is tuned to perform best on the EarthBae 7.4V battery. The 7.4V battery is simply the source built for the job, sized and tuned to deliver full performance and full runtime.

Three EarthBae products run on this battery:

The same battery that warms your core at a Friday-night football game in November drives the fans that cool you on a July move-in day.

One battery, year round climate comfort.

Which Products Use the 7.4V Battery?

The heated side is Core and Heat. Both use engineered composite heating elements across three heating zones, one on each side of the chest and one across the back, with three heat settings.

EarthBae Core is a heavyweight heated hoodie for full coverage.

EarthBae Heat is a matte black heated vest with an athletic fit and a high stand collar that leaves the arms completely free.

The cooling side is EarthBae Air, a fan convection vest that pulls air across your back and sides to accelerate your body's own evaporative cooling.

All three connect through the same USB Type-A standard and run on the same 7.4V battery, which is what lets one household power its winter gear and its summer gear from the same shelf. The full heated lineup is broken down in the heated apparel guide.

What Can You Actually Use It For?

The 7.4V system covers both halves of the year, so the same battery moves from cold-weather heating to hot-weather cooling as the seasons turn.

In fall and winter, the battery powers Core and Heat through the cold months:

  • the pre-dawn dog walk before the sun is up
  • the school drop-off line with the window cracked
  • youth hockey and figure skating, where you sit still on a cold metal bench for two hours
  • the 6 AM gym session before the building's heat kicks on
  • a drafty home office in a converted garage or basement
  • tailgates, deer stands, and campsites after the fire burns down
  • restaurant patio and valet shifts working outdoors in October
  • the RV or camper that turns cold around 8 PM
  • the freezing airport gate and the jet bridge in January
  • the long walk from a parking deck to a stadium in a wind you did not dress for

In spring and summer, the same battery powers Air through the hot months:

  • the August bike commute into a downtown radiating heat off the pavement
  • an outdoor wedding with the ceremony in full afternoon sun
  • a July theme-park day chasing a kid who will not slow down
  • warehouse, kitchen, and line-cook shifts with no air conditioning
  • landscaping, construction, and outdoor trade work in peak heat
  • summer music festivals and all-day outdoor events
  • move-in day carrying boxes up three flights in humidity
  • the back nine of a summer round when the shade runs out
  • a farmers-market or vendor booth in direct sun
  • the long hot drive in a car whose AC is losing the fight

Across both seasons, the battery does the same quiet job: it is the one thing you charge, the one thing you pack, and the one thing you recycle at the end. That is the practical payoff of a single standard.

Who Needs the EarthBae Active Thermal apparel?

A few of the people it is built for:

Almost anyone whose day moves through more than one temperature uses it, which covers most people from high school on up. A few of the groups it is built for:

  • Students and young adults wear Core across a cold campus at 8 AM and Air to a packed August concert, both running off the same battery in the same backpack.
  • Commuters and hybrid workers run Heat on a January platform and Air on the same route in July, when the train car and the street disagree by twenty degrees.
  • Parents and caregivers get through fall sidelines in Heat and summer tournaments in Air, on one charge instead of two chargers.
  • Athletes and outdoor people use the heated side for the cold start of a workout and the cooling side to recover after a hot one.
  • Nurses, teachers, warehouse crews, line cooks, and field techs reach for whichever side the season demands, in a garment that reads as everyday apparel rather than jobsite gear.
  • Older adults, who feel the cold hardest and the heat most dangerously, get a light all-day warm layer for winter and a cooling layer that reopens the summer months.

How Long Does the Battery Last on a Single Charge?

On the heated side, runtime depends on the setting. Low runs 8 to 10 hours, enough for a full workday. Medium runs 5 to 7 hours. High runs 3 to 4 hours for the coldest conditions. Most people spend their day on low or medium and save high for the coldest stretch, which is why one charge comfortably covers a normal day. The setting you choose is really a choice about how long you need the battery to last, and for most days the answer is longer than you will need it.

How Long Does the Battery Last Over Its Lifetime?

A 7.4V apparel battery lasts 300 to 500 charge cycles, which works out to roughly 2 to 4 years of regular seasonal use. A charge cycle is one full drain and refill, so topping the battery up partway through a day does not count as a full cycle. Over a normal fall and winter of wear, most owners put only a modest number of full cycles on a battery each season, which is how the same pack lasts several years before its capacity begins to fade. When you notice shorter runtimes than you used to get, that is the signal the battery is nearing the end of its useful life, not a fault in the garment.

How Do You Care For and Charge the Battery?

Treat it like any good lithium battery and it will reach its full lifespan. Charge it with the supplied charger, avoid leaving it fully drained for long stretches, and store it partly charged if you are putting your gear away for a season. When you wash the garment, remove the battery first, then wash on a gentle cycle in cold water and hang dry, never tumble dry. The full washing routine is in how to wash a heated vest or hoodie. The battery itself never goes in water.

What Happens to the Battery When It Is Done?

You send it back, for free. Lithium batteries do not belong in household trash, and most people have no idea where to take one, so it sits in a drawer indefinitely.

EarthBae built EcoDispose to remove that problem. Request a prepaid label, drop the battery in the mail, and it is recycled responsibly. No purchase required, and it is not limited to EarthBae batteries. EcoDispose accepts 7.4V batteries from other heated apparel brands too. Full details are on the EcoDispose page.

A battery standard sounds like a technical detail, but it is the quiet reason the whole system holds together. One battery shape, one charger, one recycling answer, across two seasons of clothing and dozens of ordinary days. That is what active thermal regulation looks like when you reduce it to the one part you actually hold in your hand: not a pile of separate gadgets, but one system you keep using all year.

Published July 16, 2026.