0ur opinion:

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The Kensington Battery Pack and Charger for iPhone and iPod provide a go-anywhere, backup battery pack so the music and videos can keep playing.









Piece Availability: Usually ships in 24 hours

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Buyer's feedback: - * Works with thicker cases ...
This battery pack will work if you have an Otterbox Defender case on your iPhone. Kensington told me the mini charger would work with that case, but since the case is rather thick, the connector was too short to reach. This model is bulkier, but the cable makes it easier to connect.

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Buyer's feedback: - Great Battery
This battery seems to last forever. It has been great. I go on long runs and like to listen to music and use the built in GPS. The iPhone battery alone would die in less then 2 hours. This battery is less than 50% drained in 4 hours of runtime. The only thing is that I wish the wire that came with it was smaller and less rigid. The wire is to bulky.

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Buyer's feedback: - * Poor design, too many cables and parts to keep track of ...
This battery comes with: 1 battery pack (slightly smaller than an iPhone); 1 cable to connect it to the iPhone; 1 cable to connect the wall unit to the battery; 1 wall unit. So if you travel that's three extra things you need to carry in addition to the battery. Lose one part and you're out of luck. Why they didn't simply build-in the wall unit to the battery, that would have combined three items into one and would have been simple and elegant.

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Buyer's feedback: - good and not so great
Pros:
- if I start with a fully charged brick and a fully discharged iPhone and leave them on the table I get close to a fully recharged iPhone in a little while. I haven't timed it but it seems pretty quick.
- because it uses a cord, it charges or powers any device that charges by USB. iPhone (any), Blackberry, GPS...
- you can use the iPhone while it is charging and it still charges (albeit more slowly).
- the brick is pleasantly small and pocketable.

Cons:
- requires a different (mini-usb) wire to charge the brick, so you have to carry an additional wire to recharge the brick after you've had to use it.
- connects to the iphone with a cord. It works to hold the phone to your ear and have the cord dangling to the brick in your pocket, but the cord is a pain. I like the idea of the mophie juice pack, which would still fit in my pocket or on the table or hold up to my ear, with no cord. They don't make that for the iphone 3G yet but I will get one of those too when it is available.
- my particular unit has never showed a full charge from day one, just 4 lights out of five. It works fine, I don't know if it is holding less charge than it should or if the 5th light isn't working, but it suggests less than perfect QA.

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Buyer's feedback: - * Good service, good product, good price ...
I have been making extended business trips, relying on my iPhone for e-mail as well as for entertainment. This battery was just what I needed on travel, and the price was significantly better than at the Apple Store. SuperSaver shipping got it to me an a few days, so I am pleased all the way around.