Enerpak Flexi Battery Pack

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Regular Price: $50.00

Special Price $39.95

The newest innovation in portable battery technology, the Flexi provides power when you need it most; on-the-go. This powerful portable battery is packed solid with a 4,400mAh battery which can charge almost any popular handheld device.
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Enerpak Flexi Battery Pack

Award-winning Flexi Cable
is Embedded

Do you enjoy having an extra battery around but hate having to find a cable to charge it? The Flexi has a special "flexible" MicroUSB cable built into the design. Simply pull the cable out and begin to charge! When done, simply replace the cable back and the Flexi will return to its original form. This cable works with the majority of android smartphones and tablets.

Better Batteries

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

Learn More About Our Batteries

Ultra Portable Power

The uNu Flexi is convenient power at its finest. Built to be small enough to fit inside a pocket, purse, or backpack, the Flexi can follow you everywhere. Plus, the Flexi is designed to be ultra-light making it completely travel friendly. Surprisingly, this ultra portable battery pack boasts an unparallel battery capacity of 4400mAh to boost any USB powered portable electronics.

Easy Self-Recharge

Engineered by UNU, the flexi has undergone numerous stress tests to ensure quality, reliability and safety. It can be recharged and reused for more than 500 cycles. In addition, recharging can be done by simply reversing the built-in cable and connect flexi to a USB power source.

The Battery Power of Flexi

With a minimal form factor, flexi boasts a whopping capacity of 4400mAh. It can recharge your phones 200-300%, or provide an emergency boost of 30%-40% to your iPad when you really need the juice at the point of time. With flexi in your pocket, you will always feel safe for not running out of battery. (Performance will vary depending on phone model)

Powerful and Colorful

One of the best new features of the Flexi is its color options. Available in 7 vibrant color combinations, the flexi is a perfect blend of styles and functions. Pick the color that suits you and you are also ready for a power hungry day.

The Power of "UNUversal"

Like all uNu products, the Flexi is dedicated to getting you charged and ready to go. Therefore, the Flexi is equipped with a universal(UNUversal) USB charging port to work with all of your portable exlectronics via your existing cables. In particular, Apple 30pin cable, Apple Lightning 8Pin cable, and Mini USB cable for Blackberry are all supported (but not included).

Tech Specifications

Battery Capacity: 4400mAh

Battery Type: Lithium-Polymer

Micro-USB Input: 5V/1.0A

Smartphone Output: 5V/1.0A

Dimensions: 3.5x3.0x.75 inches

Weight: 4.5 ounces

Lifetime Cycles: Up to 500 Cycles

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 our uNu Flexi Portable Battery to ensure our products stand up to the tests our customer put them to.


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 Flexi can vary. However, iPhone 5 users should expect 2 full charges.
2. Can I use this device to charge other, various devices?
A: Yes, the Flexi is uNuversal, meaning you can use the Flexi 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 Flexi 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 Flexi generally yields 500 charging cycles in its lifetime.
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