The DCB090 USB Power Source is compatible with all 20V MAX and 12V MAX slide style battery packs and allows users to connect and charge up to two small electronic, USB-compatible devices at a time. The durable and lightweight (0.5 lb) DCB090 is ideal for charging mobile phones, most tablets, MP3 players, and other digital audio devices on and off the jobsite when AC power is not available. Dewalt.