The Sennheiser BA 2015 is a compact, reliable rechargeable battery pack designed for the evolution wireless G3 and G4 series bodypack transmitters and receivers. This twin AA-style pack delivers long-lasting power and can be recharged directly inside the device when paired with a compatible charger—no need to remove it for charging, making it ideal for fast-paced professional use. Engineered with precision for touring, theatre, and broadcast environments, it offers a sustainable alternative to disposable batteries while maintaining consistent performance.