5000mah External Backup Battery for Iphone 4g, 3g, 3gs & 3rd Generation iPod Touch, Motorola Droid, HTC Android, Blackberry (curve, bold, tour, storm) & Many Different Types of Mobile Devices (White/Blue) Review

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(More customer reviews)I bought a couple of these battery packs thinking they were identical to other 5000 mah battery packs but they are not. I bought two of these last spring and I liked their ability to charge my phone at the same time the battery pack was being charged. If you only have one USB port it is important to be able to charge both this battery pack AND your iPhone at the same time. As I said earlier, I had already bought ywo of these units before and they COULD charge both at the same time. But the battery packs sold by this Amazon seller DO NOT work like the battery packs I bought 7 months ago.
It is more convenient to charge both the battery pack and your iPhone at the same time. But when you are charging this battery pack it CUTS OFF all power to anything connected to it. I don't know why this item looks identical to other battery packs when it obviously is designed differently, and not as good. Perhaps this unit is from a batch of defective or poorly engineered units. I dint know. When I presented this problem to the merchant I did receive prompt responses but they could not explain the two different designs, or the flawed design of the ones they are selling.
Another problem with this battery pack happened when the rubber stopper to protect the USB port just fell off after opening it twice.
If you are wanting a 5000 mah battery pack make sure it's one of the good ones, and not like this unit that doesn't provide power to your iPhone while you are charging the battery pack. I requested replacements for the 2 battery packs but I haven't heard anything from the merchants since I asked for battery packs that worked like the battery packs I bought 7 months earlier.
Note: There are other companies offering battery packs that are almost 20% more powerful than these units so I'd check them out before buying these battery packs. There is one battery pack that even has two charging ports instead of just one so if you like versatility then it will be to your benefit to search for a better product.

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