The terminal voltage of the battery is not constant during charging and discharging. Larger municipalities often include factories discharging industrial wastewater into the municipal sewer system. An example is directly discharging sewage and industrial waste into the ocean. Na should diffuse rapidly on MXene surfaces, which is favorable for fast charging/discharging. As of 2007, the Lithium iron phosphate battery was between 80-90% efficient in charging/discharging. Ha Tinh Steel Company illegally discharging toxic industrial waste into the ocean. Mechanical ventilation system can recover heat before discharging air externally. He carries eight umbrellas which are each capable of discharging electricity. In motor-generators, reverse current relays prevent the battery from discharging and motorizing the generator. Numerous hot springs are discharging brine and acidic liquid here. Around 1900, Seattle began discharging sewage into Lake Washington. EPA has authorized 47 states to issue permits directly to the discharging facilities. Loading and discharging by break bulk is labour-intensive. All sea anemones produce venoms delivered through discharging nematocysts and mucous secretions. In 1957 he pleaded guilty to discharging a firearm.