The BA 70 Rechargeable Battery Pack from Sennheiser is a rechargeable lithium-ion power solution for the EW-D SK bodypack and EW-D SKM-S handheld transmitters, as well as the EW-DP EK portable receiver.
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.
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I own a couple of sets of the Sennheiser BA 70 batteries. They charge quickly and last quite a bit longer than my rechargeable AA batteries. With over seven hours of time on my receiver and roughly twelve hours on my transmitter, the audio aspect of my shoots are pretty worry-free.
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.