Anywhere in the Continental US!


While they are both energy sources, there are several differences between a battery and a generator. Our Joule Case Battery Stacks are great alternatives to generators because they can be used indoors and can be recharged from renewable sources such as solar panels.

Joule Case Batteries

  • Clean
  • Quiet
  • Emissions-Free
  • Safe for indoor use
  • Expandable to meet needs
  • Rechargeable from solar power


  • Noisy
  • Smelly
  • Produces emissions & has a high carbon footprint
  • Outdoor use only
  • Power output fixed
  • Requires gas/diesel refueling

Why Would I Need a Joule Case?

You are sitting down on your couch, getting some extra time with your family when…

The power goes out without warning.

Your kids are scared of the dark,

Your wife anxiously looks outside to see that the whole street is in pitch-black darkness.

However, you think you have been prepared for these kinds of situations, and you go to the garage to start your generator.

The only problem is, you forgot to get extra fuel and your generator won't start.

Being Truly Prepared

Instead of using a noisy, smelly, and inefficient generator use our Joule Case Power Stack to truly be prepared when you need it!

Being prepared can reduce anxiety and fears. Having peace of mind during disasters and power outages can be achieved with Joule Case. Joule Case produces a battery that comes equipped with the ability to tackle the largest of energy demands. It is intended to be a reliable back up power in times where you need it most.

Power Stacks Starting at $700

Battery backup power offers much of the same benefits as traditional generators, minus the need for refueling. Our batteries can sustain power for hours and hours, with power that lasts anywhere up to 4000 watt-hours!

Joule Case Advantages

There are many advantages our Joule Case Batteries have over common gas generators when it comes to power and efficiency.

  • Having a battery backup system is that it operates without any fuel
  • Lower maintenance since they are not powered by fossil fuels or propane
  • Stackable battery backup system, which means it is buildable for more power

Joule Case Works For Multiple Situations

Not only is Joule Case the best option for a backup power source, but it also works in some situations as the main power source. This can be the case for camping and construction sites. High levels of energy can keep recreational vehicles or construction machinery running safely for hours. Joule Case is simple and consistent, no matter how you need it.

Build Your Battery System

Be Prepared For the Outages

Outages are unpredictable, and you deserve energy that is consistent and low maintenance. Batteries have a clear advantage over generators due to their accessibility and longevity of power.

How Do We Compare

Frequently Asked Questions

How long does it take to charge?
It would take approximately 24 hours to fully charge. If you purchase a fast charger, you can charge your system in around 6 hours.
How can you charge it?
An outlet with an IEC standard desktop computer cord (your purchase will come with one) or solar.
How long does it hold the charge for?
800 full cycles from 100% to 0%. Once this happens (estimated 5 years based on usage), it will drop to 80% full charge.
How long can it sit without losing charge?
Batteries can sit for a year under normal conditions without losing significant charge/energy.
How long will the Joule Case run my device?
Here’s a quick and dirty lesson in power:
All Joule Case batteries have a number in their name, ex. Li4k Base Station. These numbers refer to the Watt Hours (Wh), or the amount of energy that can be stored in each battery and can help estimate how long your device will run on your battery system. For example, a 400Wh battery should run a 100W light for 4 hours (400/100=4). When you’re deciding on what to power from your new Joule Case system, do some research into your device’s wattage consumption.
What is your warranty?
2 years for control modules and lithium-ion batteries.
How safe are your batteries?
Our batteries are safe in a couple of different ways:
  • We choose a safe battery chemistry that minimizes thermal runoff and safety
  • Joule Case does not overcharge or over-discharge batteries. This slightly reduces the capacity but increases the safety.
  • Each battery is individually packaged and shielded to prevent larger issues.
  • Each battery has a circuit breaker that shuts everything off when overcurrent is detected.
Can I take my Joule Case on a plane?
No. Under FAA regulations you are not allowed to take any battery exceeding 100Wh on a plane. For the most up to date information visit FAA Pack Safe.
Where are your products made?
The batteries come from China but our products are designed, engineered, and assembled near Boise, ID.
Can I be notified if you ever offer any discounts or new products?
Sign up to receive our email communications on our contact page. You will be the first to know about any email-exclusive deals and product launches.