These advanced medical battery packs can withstand autoclave sterilization. They can tolerate temperatures up to 137°C and are impermeable to 30 PSI of superheated steam. The plastic housing is a glass blend that helps to withstand the heat and the pack is sealed together with a gasket and screws. The interior glue and thermistor are specified for high temperature use, and a valve allows the pack to vent. The battery packs allow a portable surgical tool manufacturer to offer the run time and power to complete major orthopedic surgeries.