The Shure SB908 is a rechargeable Lithium-Ion battery designed for use with the neXt 2 MXW2X Handheld Microphone/Transmitter. The battery is identical to the one originally included with the conferencing mic and provides up to 39 hours of operating time, depending on settings and use conditions. The battery supports docked charging in the MXWAPXD2 Access Point Transceiver, allowing you to leave the battery inside the mic for a quick and easy recharge. Charging time is 8 hours.