Silver Oxide Batteries
SR44.org specializes in SR44/357 Silver Oxide Batteries
Silver Oxide batteries are compact but high-power batteries that are used in a variety of portable electronic devices that requires 1.5v of power sustained over a long period of time in the least amount of space possible. This site sells discounted SR44/357 silver oxide batteries which are one of the most common types of button batteries. They are also sometimes called silver-zinc batteries since the main chemical process for generating voltage involves a chemical reaction between silver and zinc.
It's important to understand the difference between a high quality silver oxide battery and lesser quality alkaline batteries. For example, an LR44 battery has the same size, shape and case as an SR44 silver oxide battery and even provides the same 1.5 volts. However, the silver oxide battery can last up to to four times as long! The high quality silver oxide battery might cost a dollar or two more, but it may be the difference between changing batteries once per year versus four times per year! Silver Oxide batteries are also better for the environment and contain materials that are less hazardous and less difficult to properly dispose of.
Devices that depend on SR44 batteries include high quality portable cameras (both contemporary and vintage), portable alarm clocks, watches, children's toys, digital calipers and other electronic tool. It's amazing to think that these batteries were originally developed for aircraft and even space usage, and now we're about to reap the benefits of this technology in the devices that we know and love on a day to day basis.
Wikipedia contains a more lengthy discussion of history of and the chemical processes behind silver oxide batteries.
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