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Along with the ability to provide a constant current, mercury batteries also have a very long shelf life of up to ten years. Because mercury batteries are able to hold a reliable and constant charge for extended periods, they are very useful for watches and hearing aids. For devices that require a current surge, such as flash photography or watch backlights, mercury batteries with a higher discharge rate are also useful.
Mercury batteries were ideal for photographers, and at the time, photography equipment depended on the functionality of that particular type. However, the improper disposal of mercury led to water source contamination, and thus the eventual ban of mercury batteries. Silver-oxide batteries are a current battery type that is the best replacement for mercury batteries, though the cost can be prohibitive for some. Silver oxide batteries have also replaced mercury batteries in hearing aids and watches.
Angela Oliver is an author for
Battery Web, a retailer and
wholesaler of all battery types. Please visit the site for a full selection of
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