Stitchway UltraPower 1900 mAh Backup Battery Charger for iPhone 3G, 3GS, 4, 4G, iPod, and iPod touch - External, Portable, Rechargeable (Black)

I just did a test today, I intetionally left my iphone4 run until only 3% battery life left, and then plug in this item which has been fully charged. In about 2.5 hours, this product ran out the power, and I check my iphone 4, it has been charged to 89%. Thus, this portable charger gives you roughtly 86% of your iphone 4 battery life. It cost me less than $8, thus I consider it as a good buy. BTW, this portable charger is about the half size of your iphone4.

This is excellent! I just got it today and I decided to test it so I plugged it into my iPhone, and about an hour later it was fully charged! I am now charging the Battery for later use on the long ride home. I have both an iPod touch 2g and an iPhone 4g. It works great for both! I am completely satisfied. From my experience, I've noticed that when I was about 20% left on internal battery power on my Iphone and then decided to use this battery pack to charge the phone, it restored power to roughly 85% until the external battery drained. I managed to restore that much battery power as long as I was not surfing the net on my Iphone or using it while the backup battery was attached to my phone. I decided to buy a second one for that "other" just in case moment. For the price, it was a no brainer for me. This is a great little product.

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Product Features
• *ONE YEAR WARRANTY*
• 1900mAH-largest power iphone battery in a compact size on market today
• Recharge from DEAD to fULL in less than 2 hours-COLOR BLACK
• Rechargeable at least 400 times. Special Circuitry to protect from overcharging
• Weighs only 2 oz-WIRELESS; PLUG DIRECTLY TO PHONE

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