PowerBoost Charger, Rechargeable 5V Lipo USB Boost at 500mA+ Synchronous operation means you can disconnect the output completely by connecting the ENable pin to ground. This will completely turn off the output 2A internal switch (~2.5A peak limiting) means you can get 500mA+ from a 3.7V LiPoly/LiIon battery. We had no problem drawing 1000mA, just make sure your battery can handle it! ow battery indicator LED lights up red when the voltage dips below 3.2V, optimized for LiPo/LiIon battery usage Onboard 500mA charge-rate 'iOS' data resistors. Solder in the USB connector and you can plug in any iPhone or iPod for 500mA charge rate. Not suggested for large iPads. Soldering required