This Eartec UltraLite rechargeable battery is a field-replaceable battery for select Eartec hubs and wireless headsets like the Eartec UL4S UltraLITE 4-Person Headset System. A fully-charged battery will power an UltraLite headset for up to six hours and has a charge time of approximately three hours. We include one battery with each headset, but if you need any spares, you’ve come to the right place.