Sennheiser BA 70 Rechargeable Battery Pack for EW-D Bodypack and Handheld Transmitters

The rechargeable lithium-ion battery pack for the EW-D SK bodypack and EW-D SKM-S handheld transmitters is the Sennheiser BA 70. For up to 12 hours of operation, it can be used in place of the two AA-size batteries. For BA 70 batteries, a separate L70 USB dual-charging station is needed.