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Batteries using seawater as the electrolyte have the advantage of being lightweight prior to activation, which is especially important for air-launched torpedoes. Several types are available, perhaps the most common being the magnesium-silver chloride battery with power and energy densities of up to 350 W/kg and 50 Wh/kg. Aluminum-silver versions that are now under development promise power and energy densities of up to 1200 W/kg and 250 Wh/kg. Most types need a thermal battery to power the seawater circulation pump and the control electronics, until the seawater battery becomes fully active. Simpler types include batteries for rescue beacons that become activated when immersed in seawater.
