GMYLE(TM) 1000mAh Mini External Backup Battery Charger Power Pack for iPhone 3 3G 4 4S/iPod Touch/i

• Ultra small size
• Capacity indication
• Smart technology of automatic on/off charging protects the battery from overcharging
• Battery can be rechargeable over 500 cycles
• Rechargeable by USB

The charger fits securely and is very small compared to many of the other similar chargers around so its easy to carry with you and doesn't make your beautiful iphone look like a brick when you're using it with the device attached.

My phone is a 3G and it does not charge it 100%, but more like 50% which is enough for me. So far its holding the charge over several days so it's ready for emergency use.

Cons are that when you use the charger, it has 'bits' which you have to put aside and prone to losing. Like the 'cap' and a plastic bit from where the its own usb/micro-usb charging cable is hidden.

This is my first such battery, but I am very pleased.

Edit: Been like 3 months now and working perfectly. I also take back that bit about it charging just 50%. It charges 100% of my iphone 3G battery. Full charge within an hr.

Oh, and yes, I've lost the little bits, but who cares! Battery, cable that's all you need. Charges via USB btw, which can also be used on the wall socket adapter which came via your iphone.

Edit: Half a yaer later, bought another one. No more bits, just charger and cable. Yay. Old one still working great!

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Only problem is the directions are very vague but it does do as advertised. Helped on a 10+ hour plane trip!

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These things simply do not work. I even ordered a second one to make sure. They don't hold a charge (*at all*) which renders them pointless. Plus they have their own special USB cord which is just one more thing to lose. Or really, recycle as I'm doing since these are crap.

It's a shame because the design & size is good. And if it actually, you know, charged your phone, it would work well as the connection from the battery to the phone was snug and felt secure. As opposed to a different battery i have which is ungainly and the reliability of the connection is shakey at best but man, does it charge my phone on the go.

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This product is very good. Very small quick to charge,very light and easy to use. I went and bought this product because of the short lived battery on both my ITouch and Iphone. I am always traveling and ending up with a dead Iphone/Itouch which can be rather troublesome.I have to say, it works above and beyond the price it is set at. I have tested it on both the IPhone and Itouch and have found that the product works no matter the battery level of either devices (compared to some I have tried that turned off or stopped working around 50%). Completely compatible to charge the backup battery(Iphone battery charger) with the Apple USB charger plug. If you are considering getting a backup device for your Touch/Iphone, I certainly recommend getting this device.

If you want a device that will back up your phone in a pinch, this is it. It's pretty no-frills. As another reviewer suggested, the plastic cap will ultimately be lost somewhere eventually. It is also hard to remove. The device arrives with no instructions. I have not been successful in getting it to charge fully, though I have had it plugged in overnight. I can only get it to charge my phone about 30% before it is out of power. Also, any slight movement causes my iPhone 4 to throw out a "this device is not supported" notification...upon which time the device stops charging my phone. Sometimes this happens without any kind of movement of the phone. Finally, the device does not fit on a phone with any kind of case, so you'll have to remove that to fully seat the battery. If it had some sort of extender or the connector was just a smidge longer, that would be helpful. Next time, when I purchase one of these (and I see myself having to, given the limitations of this one) I will spend the $40 or whatever for a better backup device.