What kind of button batteries are there?

Answer:

Various systems exist. The properties are matched to the key applications.

System
Application
Properties
Silver oxide
Watches and cameras
High constant voltage
Self-discharge less then 5% per year
Alkaline
Electrical appliances
Delivers high currents
Voltage drops during use
Self-discharge less then 3% per year
Lithium
Cameras and electronic devices
Self-discharge less then 1% per year
Not suitable for heavy load
Zinc air
Hearing aids
High capacity
Self-discharge of 3% per year (if not enabled).
Mercury oxide
Electrical appliances, hearing aids and cameras
Delivers high currents
Self-discharge of 2% per year
Environmentally unfriendly (15% mercury)

Mercury-containing batteries are no longer produced since 1998, and are no longer supplied by manufacturers since 1999. Zinc air batteries replaced a small number of these mercury-containing cells.

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