Shure SB900B Rechargeable Battery for Wireless Microphones

The Shure SB900B is a rechargeable lithium-ion battery designed as the current-generation power source for Shure's professional wireless ecosystem. It serves as a direct functional replacement for the SB900A, fitting seamlessly into ULX-D, QLX-D, and Axient Digital series transmitters, as well as P3RA, P9RA+, and P10R+ in-ear monitor receivers. For production professionals and audio engineers, having a dependable rechargeable battery is essential — the SB900B delivers over eight hours of continuous operation on a single charge, which comfortably covers most live events, broadcast sessions, and theatrical performances.

One of the SB900B's key advantages is its full backward compatibility with Shure's existing charging infrastructure. Whether you use individual docking chargers, networked charging stations, or rack-mounted charging bays, the SB900B drops in without requiring any hardware changes or firmware updates. The only practical difference from its predecessor is a modest reduction in runtime — roughly 30 minutes less on AD and ULX-D systems and about 35 minutes less on QLX-D — a tradeoff that is unlikely to affect most real-world use cases. For touring companies and installed systems with multiple transmitters in rotation, maintaining a stock of SB900B batteries ensures reliable, cost-effective power management without the waste and unpredictability of disposable cells.