Sennheiser EW-D Charging Set

Evolution Wireless Digital transmitters run on two AA cells out of the box, which is fine for a first show and expensive forever after. This set is the upgrade: an L 70 USB two-bay charger and two BA 70 rechargeable packs, enough to keep one bodypack or handheld running with a spare always charged.

The BA 70 is not just a battery. It reports real remaining runtime to the transmitter and to the receiver, so the display shows minutes rather than a bar graph, which is what lets a show caller decide whether a pack will make it to the end of act two. The charger takes USB power, so it travels without a dedicated supply.