Use baking soda and cotton swabs. If really bad you may use sand paper to clean connections.
a AAA battery. Or a watch battery, or a AAAA battery, or any number of battery types. http://en.wikipedia.org/wiki/List_of_battery_types
They both involve batteries.
Many different battery brands include AAA batteries some examples of AAA battery brands include two of the biggest battery brands, Energizer and Duracell.
chemicals
What are the ingredients in a AA battery?
alkaline AAA = 1.5 volts
why do aaa batteries overheat
AAA is the size of the battery, there are many types and makes of AAA battery and the shelf life for each is different.
AAA type alkaline battery is a carbon-zinc battery; the tension is 1,5 V. The electrolyte is ammonium chloride as a paste.
AAA batteries measure one centimeter wide.
AAA
8hrs