Eton BoostTurbine 2000mAh Portable Backup Battery Pack-Charger for Smart Phones (one full charge fo

• Portable backup battery pack with rechargeable 2000mAh lithium ion battery with hand turbine power generator
• Provides 100% dump charge to most smartphones when fully charged
• 1 minute of cranking will generate enoughpower for a 30 second call or a few critical texts
• Lightweight and durable aluminum body
• USB out to connect with your mobile device.

This item works. It charges well from the USB and the hand crank does charge the battery. but it does have one tragic flaw. The hand crank is only a 2 to 1 gear ratio so you have to crank it a long time to get any charge. It's easy to turn but I would have doubled the gear ratio to speed charging.

It. Charged my iPhone 5 from 40% to about 90% then did it again. Now the internal battery is dead and I am cranking it to change it back up. 1-2 min of cranking boosts my phone 1%.

For emergency power its great. If you plan on hand cranking it, make your call and find an outlet.

I will update once I have used it more, I have had it for 36 hours so far. But my power went out today so its a good test.

2.16.13 update:

I have used this from time to time over the last few months and it works reliably. I have tossed it into my lunch cooler and used several times at work to recharge my phone. The usb plug charges the device quickly. it works even faster if you use a non computer high wattage port! It holds its charge while not being used quite well, I had 70-80% after 3 weeks on non use.

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I got this because we live in Oklahoma and we lose power on a regular basis during tornado season. I wanted a way to be able to charge our cell phones in case of an emergency without being reliant on power, or on me plugging something in ahead of time to charge it.

In addition to the emergency aspect, we recently used this on a trip to New York City, when we were out and about for almost 15 hours in one day, seeing the sights. I threw it in my bag (fully charged already) and we used it throughout the day to keep our iPhones topped off.

This is a really smart investment for anyone with cell phones, tablets, or other small devices which can be powered via USB. I imagine that this will be especially useful during the first few weeks of the zombie apocalypse, and that's the most critical time for survival. Totally worth the price.

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As has been stated, I would not use this hand-crank cell phone charger if you have any other source of power to charge your phone, but I used it in a recent power outage, and it worked exactly as advertised. I would have liked the dynamo gear ratio to be a little less (it is very easy to crank, but takes longer to get a charge), but that is a very minor complaint. I'm sure others would prefer it the way it is. The bottom line: it charged my iPhone 5 and my wife's iPhone 4 without any problems.

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i was on a summer camp and me and my friends cranked it for 5+ hours and i had no charge and i did everything i needed to to use it but it is a piece of junk

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Could get exhausted cranking, but that is how it is suppose to work. Sturdy and durable for its small size.