Griffin Technology RC23103 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

I have tried out 3 different battery packs/cases for my phone but this definitely is the only one I ended up keeping. It's small and convenient and I like how the charger even has a connection for your lighting usb cord so you can charge your phone and the battery at the same time! it gives me about 40% battery (if I'm not constantly texting or having tons of apps open as i usually do). My only problem is that light up button stopped working? but it's a minor detail...because it still charges and holds charge!

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Works great for emergency charges while traveling. Provides about 45% more battery charge. External battery gets warm when charging so if you leave it in your pocket while charging, it just keep you warm.

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The Good: Excellent design, solid construction, power adapter and extra battery in a practical set, good price-performance ratio. The bad: a little bit of warming in the battery to charge the iPhone 4S Only 515mAh effective load +/36% or 2.88h additional time for call.

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Great product. It't the second one I buy because I love it so much. The second one is for my brother.