Water-activated battery
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Image:Side-view-water-activated-battery.jpg Image:Water-activated-battery-in-wrapper.jpg
Water-activated batteries are disposable batteries that do not contain electrolyte and hence produce no voltage until they are soaked in water for several minutes. They are specifically designed to be more environmentally-friendly due to an absence of heavy metals. Water-activated batteries are used most commonly in radiosondes which cannot contain heavy-metals because they regularly fall to the ground or ocean surface and remain there indefinitely.
