The Sennheiser BA 70 is a rechargeable lithium-ion battery pack for the EW-D SK bodypack and EW-D SKM-S handheld transmitters. It can be used in place of the two AA size batteries to provide up to 12 hours of operation.
The L70 USB dual-charging station (available separately) is required for BA 70 batteries.
| Type | |
| Capacity | |
| Voltage | |
| Charging Time | |
| Temperature Range | |
| Humidity (Relative) | |
| Dimensions | |
| Weight |
| Package Weight | |
| Box Dimensions (LxWxH) |
I used these batteries for 3 days at a trade-show with my EW-DP set - filming six one-hour long presentations (many of which were closer to 90 minutes). By the end of my job (I do forget whether the TX or RX uses more power) - the one had over two hours left and the other had nearly 5. I know some shooters/sound people prefer AAs, but I enjoy having a dedicated battery for a dedicated product. I just ordered another set to have as backup.