XTAR VC4 Charger for Ni-MH/Li-ion Batteries (4 Port) The XTAR VC4 is an intelligent charger for Ni-MH and Li-ion Batteries. It automatically determines the battery type and size before charging. It can charge up to four batteries at the same time. Each port is independent so that different types of batteries can be charged at the same time. The larger port size of this charger allows for charging from AAAA to D size batteries. This unique charger also has the ability to recover batteries that have been over discharged and are currently unusable. You can use this device anywhere as power can come from a variety of sources such as a USB port on your PC, any USB style wall adapter or other power sources with USB style plugs. The LCD display clearly shows battery type, input voltage, battery voltage and charge rate. The display also shuts off to save power and with a press of a button to turn the screen back on. An excellent device for charging Ni-MH and Li-ion batteries.