IMO it would not have to be a straight up Stackpole but it could be software loaded in whatever their implants data storage is that just gets dropped into their mech/vehicle/ASF/BA that cuts out the breakers and causes a uncontrolled power surge that burns out the equipment's computer. ALL the wiring on the mech or whatever is toasted, everything controlled by the computer- gyros, reactor, myomer, every little electric motor that moves coolant, every fan in the heat sinks, weapons, etc all fried by the voltage.
Sure you can salvage that Celestial . . . but its just a pile of scrap metal, you will hardly get anything useful out of it.