In a method of manufacturing a bonded substrate stack by bonding a first substrate having a porous layer to a second substrate to prepare a bonded substrate stack, and separating the bonded substrate stack into two substrates at the porous layer, defects in the separation step are prevented. In order to restore the correlation, a suspect image is analyzed for the presence of a repeated data pattern. Audio voice input information is detected. The assembly also includes a hollow collimator in which the detector is positioned. The battery maintenance kit may also include a voltmeter, wrenches, a flashlight, battery side mount conversion terminals and a battery post cleaner.