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The Energy Shield is a LiPo battery-based power shield that keeps your project alive. It keeps its battery charged whenever a power source exists. It accepts a wide range of power sources, from common solar cells via JST connector to USB via a USB port on microcontroller, to 9V and 12V DC adapters via the DC Jack on your Arduino. Not only can it provide power for your Arduino project, it can also rescue your mobile electric devices, such as mobile phones, MP3 players, and tablets from dead batteries with the standard USB port on the shieldX.
For more technical documentation, please visit the manufacturer's wiki page here.