Adafruit PowerBoost 1000 Basic - 5V USB Boost @ 1000mA from 1.8V+<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Synchronous operation means you can disconnect the output completely by connecting the ENable pin to ground. This will completely turn off the output</li><li>4A internal switch means you can get 1000mA+ from as low as 1.8V， 1500mA+ from 2 NiMH or Alkaline batteries， and at least 2000mA from a 3.7V LiPoly/LiIon battery or 3 NiMH/Alkalines. Just make sure your batteries can actually supply the required 2-4A， OK?</li><li>Low battery indicator LED lights up red when the voltage dips below 3.2V， optimized for the most common usage of LiPo/LiIon battery usage</li><li>On-board 1000mA charge-rate 'Apple/iOS' data resistors. Solder in the included USB connector and you can plug in any iPhone or iPod for a speedy 1000mA charge rate. Works with iPads， both mini and 'classic' type.</li><li>Full breakout for battery in， control pins and power out 90%+ operating efficiency in most cases (see datasheet for efficiency graphs)， and low quiescent current: 5mA when enabled and power LED is on， 20uA when disabled (power and low batt LED are off)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51hIrM2jYAL.jpg" noproxy>