EARTEC CH-CS28P Comstar Multiport Replacement Desktop ChargerA tremendous feature of COMSTAR wireless is that the batteries charge externally from the headsets so they can be replaced in the field when necessary. The multi port charging sled can charge spare batteries while the system is I use and is designed to handle both COMSTAR headset and Com Center batteries. Individual LEDs indicate each battery is fully charged when they turn from red to green. Charging takes about 4 hours.