The Pico 100A AC/DC Current Clamp (TA408) with PicoBNC+ does not require a battery, it is powered by the scope (4225A/4425A) via the PicoBNC+ connector. The PicoBNC+™ enables the PicoScope software to auto-configure itself for the TA408 100A AC/DC Current Clamp when used with a compatible PicoScope ... See More