Griffin Technology NA23103 PowerBlock Reserve for iPhone and iPod, 5 Watt, Black

• 2 chargers in 1: PowerBlock AC charger plus detachable Reserve battery pack for iPhone and iPod
• 5 watts of fast charging power from almost any wall outlet
• Reserve battery extends phone time up to 2 hours, music time by 12, video time by 3, and surf time up to 3 additional hours
• Energy Star rated to save energy when not in use, without sacrificing performance

This is an excellent two in one device for anyone with an iPhone. I've used it was my 3G and now my iPhone 4 to great effect. It'll add about a 30% charge to your phone, but keep in mind that it's a pretty small battery. And the charge is perfect you can use it to charge both your iPhone and the extra battery at the same time. I've had mine for two years and it still holds a charge beautifully.

HIGHLY recommended.

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The item was sent to me in perfect state, everything good so far, it gives me aproximately 30%-40% of battery charge to my iPhone, excelent piece of technology, fully recommended...

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It seemed to work fine for a while, but suddenly now the battery won't charge. If I charge the battery and iPhone at the same time, the iPhone goes nuts as if it's being plugged in and unplugged rapidly. It continuously vibrates or makes noise until I unplug it. When this happens, the battery stops charging and all of the lights on it flash. Since this started happening, the battery won't fully charge at all. It also gets VERY hot when connected to the phone, stops charging, and does the same plug in/un-plug thing while either vibrating or making noise continuously. It's kinda hard to explain without seeing it. I'm afraid it's going to damage my phone. Take my advice, don't bother with it.

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I am not happy with this PowerBlock at all. It gets so hot while it's charging my phone and it stop working. I am afraid that it will ruin my 4S's battery.I will have to return this product.

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This product is awesome. I am on my 4th ipod. I like the classic and don't feel the need to buy another one but the battery SUCKS. Don't bother fast forwarding, searching for songs and don't dream of watching a movie.. my ipod would die in 2 minutes even with a full charge. I do not leave home without this charger. The back up battery will go for a good 4 hours and the lights let you know how much battery lifeyou have left. I have two of these. Bought the first one for $65 at Best Buy until I realized Amazon had it.