Adafruit powerboost 500 charger rechargeable 5v li po usb boost 500ma adafruit 1944 p the adafruit powerboost 500 charger is a great power supply for your next portable project powered from a 3 7v li ion or lipo battery it will produce a steady 5 2v output giving you headroom for cable resistance high inrush currents or maybe a protection diode its internal 2a boost converter will supply more than 500ma from sources down to 2v and up to 1000ma from a suitable 3 7v lipo or li ion bat