i.Sound Universal Powerflash Backup Battery for iPhone, iPod, and most USB devices - 1400 mAh

• For iPhone, iPod, smartphones, MP3 players, digital cameras and most USB powered devices
• Power indicator LED
• Includes 3 foot USB to Mini USB cable
• Built in flashlight
• 1400 mAh

well, to start off, this product looks pretty cool. But when i received it, i charged it up and all the LED's lit up and when i held the side button, the flash light would come on. But if this product isn't plugged in the charger, IT WILL NOT WORK! this defeats the whole purpose of a "portable back up" battery. I tried many different ways on how to turn it on, i tried pushing both at the same time, tried the buttons separately, tried double clicking, it would not turn on unless plugged in its charger!

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Muy buena opción para llevar un extra de bateria para el iphone / ipod sin sacrificar espacio y volumen, recomendado 100%