EZOPower 2 USB Port Compact External Portable Rechargeable Emergency Backup Battery Charger 5000mah

• Universal, convenient, portable, and compact external rechargable back-up battery
• Compatible with most portable devices (Mobile Phones, Music Players, Portable Gaming Devices, Digital Readers, etc.)
• Charges via included USB cable + Includes interchangable charging tips such as mini USB, micro USB, and more for your convenience.
• 2 USB ports for Dual Charging, 5000mAh battery capacity, 5.35V output voltage, 1000mAh output current.
• Includes 1 year warranty.

Works great for my EVO, and Nook.

I had troubles at first (My Evo showed it was charging but then would run out of power and die). But I realized through trial and error that you have to turn the battery on first (ie the blue light are lit up), otherwise its not really charging, even if it looks like it is.

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The device comes in a white box with no instructions. The first thing you need to know is that you must press and hold the center button for several seconds for the battery to begin charging your devices; same to turn the battery off. This was not obvious; they should have provided some minimal instructions.

Some other minor frustrations:

* The port for charging the device is mini-USB. Micro-USB is the new standard for cell phones and every cell phone charger I have is micro-USB. It would be nice if I could carry around just one cell phone charger and use it for charging my phone and as well as this device.

* The package comes with adapters for every imaginable connector type for use with the two retractable cables they provide, but it only comes with one of each so you have only one micro-USB adapter and every device I own now uses micro-USB. However, you can plug any standard USB cable into the device and just opt to not use the retractable cables they provide..

I'm giving this 4 stars primarily because it's a good value for the price. I'm using it with the HTC EVO 4G and it works well.

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I used this battery yesterday to charge my EVO. With the phone on, the flash, and the camcorder recording, it charged my battery from 75% to 98%. It probably would have charged it to 100%, but I unplugged it because I had finished recording.

(The reviewer who said this product did not charge his EVO may want to get it checked out, as I have read that some EVOs have had some charging issues.)

Also, even after charging the night before, and while using it, it only felt very slightly warm, almost completely cold. I have used a similar product from Black & Decker that was bulkier, and it got very hot when charging and during use.

Im my opinion, it is well worth the money, and I will be buying 2 or 3 more soon!

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Review after a quick two days of use:

While the raw output voltage may not be strong enough to run some larger devices, I found that it would take my Fuze cell phone on "mifi" mode and stretch its life from the phone battery alone of 1.5 hours to a total of almost 5 hours combined. The $22 spent is well worth it.

My rating is more of a 4.5 based on what you get based on price.

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There have been some on here that have complained that their EVO 4G phones continued to drain even though the device was plugged in. I am sure they noticed this especially with power intensive tasks such as Google Navigation.

The reason is not the device itself, but the USB cable. Although the EVO is rated to charge at 1 amp (1000 ma), USB cables are only rated to charge at 500 ma. While plugged into a power source, your EVO continues to run off it's battery. This means that although plugged in, if you battery is charging slower than it is using power, your phone will eventually die. In other words, it's not a "defect" but simply the nature of the beast.

Those who reported their batteries charging fine on their EVO's were likely doing less power intensive tasks such a browsing the web. Google Navigation may be the greatest power vampire on your phone simply because it is 1) constantly scanning for GPS, 2) computing your location, 3) updating the graphical interface, 4) keeping the screen on and 5) talking to you through the audio.

If you find yourself in a low power situation and wish to use Navigation, I recommend that when using Google Navigator, select the "Get Directions" option. No, it won't talk to you, but you won't lose power (and your navigation) half way there either.