A hole inspection system for a pierced container 1 for inspecting an outwardly opened hole la formed in a flexible container 1 for performing a proper inspection for the size of the hole la of the flexible pierced container 1. The coatings possess a self-similar structure with two feature sizes that are tuned to affect the wetting of water and freezing of water on the surface. Thereby, the planar material is formed, i. High voltage AC power used in recharging the high voltage battery is switched using contactors physically isolated within the battery cycler, in order to protect operating personnel from coming onto contact with high voltage. The first conductive portion is connected to an electro static discharge circuit.