Shure SB905 Li-Ion Battery for MXW2 TransmitterRechargeable LI Ion battery for newer style MXW2 handheld transmitters. MXW lithium ion rechargeable batteries use advanced chemistry that maximizes transmitter runtime. Power management from the control software provides detailed visibility to critical battery parameters such as charge status, battery capacity, and cycle count. Batteries charge to 50% capacity in one hour and to full capacity in two hours using the MXW Networked Charging Station.