uNu Enerpak Tube Flashlight Universal Battery Pack for Smartphones and Tablets

The ultra-portable Enerpak Tube features a 5000mAh battery which can power almost any smartphone 2.5x! Available in an assortment of colors, the Tube is the perfect blend of power and pleasure.
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Tube Front

  • Enerpak Tube Black
  • Enerpak Tube Blue
  • Enerpak Tube White
  • Enerpak Tube Pink
  • Hand Held Tube
  • Tube Charging


Ultra-Portable Power

The uNu Tube is small and light making it the perfect power accessory for on-the-go use. Bring it with you for a camping trip, a night on the town, or leave it in your car. The Tube fits perfectly in a pocket or purse making it a perfect travel companion.


Better Batteries
The Enerpak Tube 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 Tube is the best it can be so you’ll have long-lasting power! Learn more about what’s inside a Enerpak Tube and what makes it so great here!




Color Coordinated

Since the Tube is designed to go where you do, we made the Tube in an assortment of vibrant colors to reflect your own personality. Available in Magenta, Sky Blue, Glossy White, and Glossy Black, there's a color for everyone.



The Power of
"uNuversal" Charging

The Enerpak Tube is built with power-sharing in mind. Need to charge an iPad tablet, HTC phone, or a Samsung Note? No problem! The Tube can charge almost any type of hand-held device.




A Case Built to Last

We use only the finest designs, materials, and people when creating our cases to ensure 100% reliability from anything we produce. That's why we gladly offer a 1 year warranty on all of our products to ensure our products stand up to the tests our customer put them to.
Enerpak Tube
Battery Capacity
Battery Type
Micro-USB Input
Smartphone Output
4.0X1.75X0.8 inches
4.3 ounces
Lifetime Cycles
Up to 500 Cycles

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 Tube can vary. However, iPhone 4 users can generally expect about three full charges while iPhone 5 users should expect about two and a half charges.


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

A: Yes, the Enerpak Tube is uNuversal, meaning you can use the Tube 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 Tube have?

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


5. 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.


6. What is special about this particular Enerpak?

A: The Enerpak Tube is our most portable power-pack. With a 5000mAh internal battery the Tube can charge almost any portable electronic device all while being able to easily fit in a pocket.


7. 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.


8. 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 the LED display on the front of the Enerpak and will begin flashing red. The Enerpak Tube will be fully charged once the LED displays a continuous blue light.


9. How do I know if my Enerpak Tube has power?

A: PRESS the power button on the side of the Enerpak once. A LED display will apper. If the light is blue, the Enerpak has power remaining. If the light is red, the Tube needs charging.


10. How do I turn my Enerpak Tube 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.


11. What does 1A above the USB port mean?

A: The code "1A" next to the USB port refers to Amps. The 1A port is used for charging smart-phones and iPods and MP3’s. Other uNu products, like the Vault carry a  2.1A port which is meant to charge larger devices like tablets and e-readers.


12. 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.