company: on September 29th, 2004, Sony Corporation (Tokyo, Japan) announced the accomplishment of the world's first mercury-free silver oxide battery, long considered a difficult feat by the industry. Sony now produces silver oxide batteries of all sizes and currently has the top market share.

product: Silver Oxide Battery is a small-sized, mercury-free primary battery, mainly used for wrist watches, using zinc as the negative electrode (cathode), silver oxide as the positive electrode (anode) and an alkaline electrolyte. Thanks to its high energy density and discharge characteristics, silver oxide batteries are being used in a broad range of applications, from quartz watches to portable devices such as electric clinical thermometers and portable games.

sustainability features: the main innovative feature of the silver oxide battery is that it integrates the reducing principle in the sense of reducing both size and environmental impact.

• small-sized: to cope with a sharply-growing demand for high-quality, compact and slim batteries, Sony has realised a line that is very small-sized and compact;



• mercury-free: in January 2005, 10 models of the world's first mercury-free silver oxide battery began to be commercialised on a worldwide basis. Sony annually sells about 400 million silver oxide batteries worldwide. Considering the fact that the mercury level of Sony's silver oxide batteries is 0.2% of total battery content, making them mercury-free will lead to reducing annual mercury usage by 320 kg, a dramatic contribution to protecting the environment.In fact, 1 gram of mercury is enough to contaminate 1,000 m³ of water and 20 tons of food!



• lead-free: the usage of lead has also been eliminated in the mercury-free silver oxide battery.