uNu Enerpak Vault Dual USB 2.1A Universal Battery Pack for Smartphones and Tablets

A powerful 11,000mAh portable battery with the ability to charge your favorite devices multiple times. The Vault features two USB charging ports for double the charging efficiency and an integrated flashlight.

uNu Enerpak Vault Dual USB 2.1A Universal Battery Pack for Smartphones and Tablets


Recharge Your Products
Up to 5X's

This powerful Vault of energy has a powerful (11,000mAh) rechargeable battery which can refill even the most power hungry devices multiple times. The Enerpak Vault is built to last longer than any portable device you throw at it!


Better Batteries
The Enerpak Extreme isn’t just “made” it’s engineered to be a finely tuned energy supply that helps you live a better life. In fact, we make sure every component of the Enerpak Extreme is the best it can be so you’ll have long-lasting power! Learn more about what’s inside a Enerpak Extreme and what makes it so great here!



    Two Charging Ports Doubles
    Charging Efficiency

Never worry about juggling USB charging ports again! Built with two USB charging ports, the Vault can charge two products at the same time! That means up to a 50% less wait time to charge your products.




Easy to Use: Single
Button Interface

All within a single button you can turn your Vault ON and OFF and check current power levels via the LED power indicator. Never has a portable battery been this easy to use! to impress just about anyone.


Take the Extreme
With You!

Like all our Enerpaks, the Vault is built to be portable. Take it with you on a trip, leave it in the car, or put it in a backpack, the Vault is ready to go whenever you need it. Plus, with its huge power capacity, the Vault is great for extended trips.


Built to Last

We use only the finest designs, materials, and people when creating our batteries to ensure 100% reliability from anything we produce. That’s why we gladly offer a 1 year warranty on all of our Enerpaks to ensure our products stand up to the tests our customer put them to.


Enerpak Vault
Battery Capacity
Battery Type
Micro-USB Input
Smartphone Output
Tablet Output
4.75X3.1X1.0 inches
9.2 ounces
Lifetime Cycles
Up to 500 Cycles

Customer Reviews

Highest quality, most powerful - extremely impressed. You get what you pay for
posted by Betty on 11/8/13
Outstanding product. As the headline states, highest quality, most powerful and I'm impressed.

I purchased a different external battery for my iPhone and it turned out to be complete garbage. Poorly made, terrible quality, and could not hold a charge from the very first try. It was one of those high milli-amp "too good to be true" priced external battery. Well, you get what you pay for.

This product is the real thing. Again, excellent quality. Save yourself the headache and pay the extra 10 bucks.
An awesome device
posted by Raymundo on 3/6/13
I'm always on the go and travel regularly for both business and pleasure. I have numerous devices; iPhone, iPad, Motorola and Plantronics wireless headphones. I love all these devices but power consumption is always an issue. I initially bought a smaller external battery for my iPhone but it fell well short of my power needs and would not charge my iPad or any of my other devices. I did some diligence and found uNu. I read several reviews regarding both their products and customer service, found both to be stellar and decided to buy their latest and greatest enerpak vault. I initially bought -1- unit for myself and found the quality of the product and the power capacity so superior to anything on the market I decided to buy -4- additional units for my family and friends. Everyone I know has multiple devices and I am confident they will love this thoughtful gift as much as I do!
Great Product
posted by Brian on 2/15/13
I purchased this product a little over a week ago. I have not needed to recharge it yet and I own an iPad and iPhone. Really Cool! Thanks UNU!
Best solution for multiple device users
posted by Frank Turk on 2/12/13
I bought the UNU dual USB battery pack three weeks ago on WOOT.com because I have been searching for a high-capacity battery solution that could support both my iPhone and my Android tablet while I travel. I came for the 11000 mAh capacity. I stayed for the compact size & easy use.

Listen: if you travel at all, and you spend most of your time on the airplane rather than in the airport, and you use more than one mobile device, this is your ticket to extraordinary charge life and optimal productivity. If you can stay awake long enough to run this power supply down to zero, I want to hear your story.

I bought mine for less than they are selling them here at UNU, but it is totally worth the price UNU is charging.
UNU is a great company
posted by Bradleyw801 on 2/7/13
I bought one of the 11000mah battery backups off woot, unfortunately it wasn't working properly when I got it. One email to UNU and they sent me a replacement no questions asked. If I ever need a product of this type again, this will be the first company I look to.
posted by 1st Review on 12/17/12
this is an amazing battery!

Media Reviews


Cult of Mac Enerpak Vault Review"Fully charged, the Vault will see you through the day with almost any conceivable combination of devices"





iLounge Enerpak Vault Review


 "Enerpak Vault is actually pretty impressive."

1. How many times can this device charge my iPhone?

A: Because each generation of iPhone has a different battery capacity charging results from the Enerpak Vault can vary. However, iPhone 4 users can generally expect about five full charges while iPhone 5 users should expect about four.


2. Can I use this device to charge other, various devices?

A: Yes, the Enerpak Vault is uNuversal, meaning you can use the Vault to charge any devices that use a micro-USB port to charge!


3. I left my Enerpak in the car for a few hours, and when I returned the Enerpak was very hot, does this adversely affect the battery inside?

A: We recommended that the Enerpak is always kept in a cool location for a couple of reasons. One, heat will degrade the battery. Two, such a hot case could hurt you.


4. How many charging cycles does the Enerpak Vault have?

A: The uNu Enerpak Vault generally yields 500 charging cycles in its lifetime.


5. Where do I buy the tips for the Vault if I lose them?

A: If you have misplaced a specific charging tip please use our technical support form to request a new tip.


6. Is the warranty for this product similar to the warranty on the phone cases?

A: All products sold by uNu Electronics are covered by a one-year manufacturer warranty. For more information on our warranty please click here.


7. What is special about this particular Enerpak?

A: The Enerpak Vault has the ability to charge multiple products at once. The Vault can charge both a smartphone and a tablet simultaneously. The 11,000mAh is the most powerful of all the uNu products, perfect for heavy-users and extended trips.


8. What can I do to get the most out of my battery?

A: Some helpful tips include: Fully charging the Enerpak by itself overnight before using the product for the first time and keeping the Enerpak out of extreme temperatures to minimize battery degradation. If you would like to learn more about how to get the most out of your Enerpak click here.


9. How do I charge my Enerpak?

A: Use the included micro-USB cable and attach the micro-USB (the smaller end) end into the Enerpak where it says “IN”. Plug the other end of the cable into an available USB port either on a computer or USB wall charger. If done properly an LED display will appear next to the power button on the front of the Enerpak and will begin flashing. If there is only one bar flashing, the Enerpak is empty, if there are four bars the Enerpak is full.


10. How do I know if my Enerpak Vault has power?

A: PRESS the power button on the front of the Enerpak once. A LED display will appear. The number of bars shown indicates the amount of charge left in the battery. 4 lights =100% - 75%, 3 lights = about 75% - 50%, 2 lights = about 50% - 25%, and 1 light = about 25% - 0%.


11. How do I turn my Enerpak Vault ON and OFF?

A: Simply, press the power button on the front of the Enerpak to turn it ON. The Enerpak will automatically turn OFF after 25 seconds of non-use.


12. What do the USB ports 1A and 2.1A mean?

A: The numbers “1A” and “2.1A” above the USB ports refer to Amps. The 1A port is used for charging smart-phones and iPods and MP3’s. The 2.1A port is meant to charge larger devices like tablets and e-readers.


13. I need more help with my Enerpak!

A: If you do not see the answer you are looking for here. We also have a general FAQ section which might help answer your question, or you can go to our technical support page to ask a specific question.