DFR0564 USB Charger for 7.4V LiPo Battery DFRobot DFR0564 USB Charger for 7.4V LiPo Battery is a compact and efficient device that can charge the 7.4V lithium battery up to 1A. This USB charger features a lightweight micro-USB interface ideal for outdoor applications. The DFR0564 USB charger can also be embedded in a variety of 7.4V lithium battery-powered projects, adding a USB charging function. This also eliminates the need for battery swapping and bulky power adapters.