Sennheiser L70USB

The L 70 USB is a two-bay desktop charger for Sennheiser's BA 70 rechargeable battery packs, the lithium-ion cells that power Evolution Wireless Digital bodypack and handheld transmitters. It refills a pair of packs at once, typically in about three and a half hours, and its temperature-managed charging looks after cell health so the packs hold their runtime across many cycles. A compact housing keeps it tidy on a rack shelf or prep bench.

Power comes over USB at 5 volts, and the charger ships with the NT 5-20 UCW power supply so it is ready to run out of the box. Each of the two bays charges at up to 860 milliamps at a nominal 4.35 volts, and the unit itself measures 100 by 35 by 70 millimeters and weighs about 86 grams.