The Shure SB900A rechargeable lithium-ion battery powers ULXD, QLXD, and Axient Digital transmitters, providing up to 9 hours of runtime on a full charge. Perfect for eliminating disposable batteries in wireless systems. Component Only: This listing is for a single battery. Transmitters, receivers, and chargers are not included and should be rented together as part of a full wireless kit. Includes: One fully charged SB900A battery. Specs 3.7 V / 2,100 mAh Li-ion Runtime: Up to 9 hrs Charge time: 3 hrs (full) / 1 hr (50%) Compatible with ULXD, QLXD, Axient Digital Manufacturer Link: Shure SB900A Rechargeable Battery ( https://www.shure.com/en-US/products/accessories/sb900a )