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EARTEC 3.7V Rechargeable Lithium Ion Battery for HUB Ultralite HeadsetSince UltraLITE headsets feature self contained, "All in One" design all electronics, even the battery, is installed in the headset plastics. The batteries are lightweight and about the size of a book of matches. They charge in about 3 hours, run for 6 hours and can be changed ou..