Sennheiser BA 30 Rechargeable Battery Pack

The Sennheiser 505974 is a dedicated rechargeable battery pack that keeps evolution wireless D1, SpeechLine Digital Wireless SL, and AVX SK bodypack transmitters powered through long rehearsals, presentations, and recording sessions. It supplies a steady 3.7 V from a 2030 mAh lithium-ion cell, replacing disposable AA batteries with a single power source that you can recharge hundreds of times.

Audio engineers, event managers, and content creators who rely on wireless systems will appreciate how quickly the pack slides into a compatible transmitter and locks in place. The design is compact and light in weight, so performers and speakers hardly notice it on a belt, in a pocket, or clipped to a guitar strap. Fewer battery changes mean fewer interruptions and more confidence on stage or in the studio.

Recharging is straightforward. Drop the pack into a Sennheiser charging dock or charge it while installed in the transmitter when the model supports USB power. Integrated protection circuitry monitors the process, which helps preserve cell health and ensures consistent run time over many charge cycles. Choosing this rechargeable option also reduces ongoing battery costs and cuts down on environmental waste.

• 3.7 V lithium-ion rechargeable battery engineered for Sennheiser bodypack transmitters
• 2030 mAh capacity that supports extended sessions without battery swaps
• Works with evolution wireless D1, SpeechLine Digital Wireless SL, and AVX SK transmitters
• Compact and light construction that integrates neatly with the bodypack
• Quick slide-in installation with a professional black finish