The Sennheiser BA40 is a dedicated, high-capacity rechargeable lithium-ion battery pack engineered to power the professional Sennheiser SL 133-S DW and SL 153-S DW digital wireless table stands. This battery solution is designed to provide extended, reliable operating time for these specialized microphones in demanding environments such as broadcast studios, conference halls, council chambers, and corporate boardrooms, where continuous wired power may be impractical or aesthetically undesirable. By replacing disposable alkaline batteries, the BA40 offers a more sustainable, cost-effective, and operationally streamlined approach, eliminating the downtime and waste associated with frequent battery changes while ensuring consistent voltage delivery for optimal microphone performance throughout its discharge cycle.

This battery pack is built with professional durability and integration in mind. It features a form factor and connector specifically designed to fit seamlessly into the battery compartment of the compatible Sennheiser table stands, ensuring a secure physical and electrical connection. The integrated electronics include protection circuits to prevent overcharging, deep discharge, short circuits, and overheating, safeguarding both the battery and the sensitive microphone electronics. Its lithium-ion chemistry provides a high energy density, resulting in a long runtime per charge while maintaining a relatively compact and lightweight profile. This allows the table stands to remain portable and easy to position without the burden of a power cable, preserving a clean, professional appearance on stage or on camera.

For charging, the BA40 is designed to be used with Sennheiser's dedicated charging ecosystem, such as the CHG 4N or CHG 2N network chargers, which intelligently manage the charging process to maximize battery lifespan. The battery's performance is characterized by a stable output voltage that remains largely constant until near the end of its capacity, unlike alkaline batteries which gradually decline, ensuring the microphone's RF output and audio performance remain uncompromised throughout the usage period. The adoption of the BA40 battery system represents a strategic investment in reliability and workflow efficiency for any venue or production company utilizing Sennheiser's advanced digital table stand microphones, guaranteeing that critical audio capture is never interrupted by power failure.