Kensington Travel Battery Pack and Charger for iPhone and iPod touch (Black)

• Compatibility: iPod mini; iPod nano 1G, 2G, 3G, 4G; iPod classic 1G, 2G, 4G, 5G, 5.5G, 6G; iPod touch 1G, 2G; iPhone 1G, 3G, 3GS, 4
• Rechargeable lithium-ion battery for iPhone featuring all-in-one design
• Built-in dock connector to charge your iPhone and flip-out USB tip to recharge without the mess of extra cables
• Extends play time up to 23 hours music, up to 7 hours of video and up to 5 hours of talk time
• LED battery gauge displays remaining battery pack power level

We bought this product for our iPhone 3G and it worked fine. However, we noticed that the battery would drain very quickly when we plugged it into the iPhone 4 that we recently purchased. I confirmed with Kensington that this item is not compatible with iPhone 4, so I thought I'd share this in case you are looking for a battery charger for your iPhone 4. Otherwise, it works great with the other generations of iPhone. Kensington did mention that a charger may be available for iPhone soon, but they wouldn't/couldn't advise as to when such an item will be available.

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I bought the battery right before a trans-Atlantic flight. The battery is small enough to fit in your pocket, but powerful enough to last all day. During the flight I watched 5 hours of video (2 feature movies), then listened to music while playing games for another 2 hours. All of this and the battery was only down 1 (of 5) LED's!!! This is on top of "topping off" my phone's internal battery from 80% to 100%. The music + games had previously drained my phone's battery on a 4 hour flight.

In addition to the long life of the battery, it's also endowed with 2 other great features. First, it is designed to let you watch video landscape mode, a big plus. Second, the built-in USB charging capability is great... it avoids the need to carry extra cables (assuming you have a USB device with you on the trip).

For the record, I use the battery on a iPhone 3G 16GB edition.

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I met the Kensington rep at an event where he was showing the Travel Battery Pack and Charger to a group of us. I've used a number of other plug in batteries, but this one has a lot more juice for a compact package. The bonus is that I can watch movies on the plane while I'm charging my phone. Works great and USB connector means I don't have to carry an extra cable.

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I'll cut to the chase: Lifesaver. Fits in a pocket, provides a full charge on the spot and on the go, plug-and-play simple (no cords; plugs right into the dock connector on the iPhone). For an iPhone junkie like me, this is mandatory equipment. Plus, it charges any iPod with a dock connector, so I use it for my kids' iPod Touch units, as well. Indeed, it's tempting to buy one for each pocket in every jacket, shirt, pants, and shorts I own. I know, obsessive. But if you're reading reviews of back-up iPhone chargers, you, too, have already crossed that line. The only downside is that you have to remember to charge it once you use it, because needing an emergency charger for your emergency charger is not a happy moment. But, really, this is the best use of $40 an iPhone user can make. So stop reading. Buy.

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Ok, I bought one about 3 weeks ago, it barely charged the iphone once before saying that there was no charge left so I assumed it was faulty and bought another one (as the old model worked great). Unfortunately same thing. It charges the iphone 4 for about 15 minutes until there is about 3/4 of the iphone charged, and then the blue bars go from 4 or 5 to nothing and it has to be completely recharged. This item is absolutely worthless for the iphone 4. I havent tried it with another iPhone but again, their previous model seemed to work much much better and would recharge my iphone at least 3 full charges.