When most people think of leak testing, one childhood event probably comes to mind: Submerging a filled bicycle inner tube in a sink full of water, hoping to find the exact leak location by following a trail of air bubbles. This method of leak testing, known as bubble immersion (BI), is frequently used by manufacturers on parts that can be internally pressurized with air and not be damaged by water.
Inner tubes, flow meters, medical device packaging and many other products meet both of these test criteria. Lithium-ion batteries, however, do not. This is true regardless of their size, whether small enough to use in a cordless tool or snow blower, or large enough to power a plug-in hybrid or fully electric vehicle (EV).