Shure

The SB903 lithium-ion battery serves as a replacement or spare battery for the SLXD1 and SLXD2 wireless transmitters. Shure's smart battery technology lets you monitor remaining charge time, total number of charge cycles, and other useful information. The battery provides up to 8 hours of continuous operation when fully charged, and is made to avoid "memory effect" so you'll always get a full charge. Battery charger sold separately. Warranty: 2 years.