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There are five popular hearing aid batteries known by the numbers 675, 13, 312, 10 and 5. All manufacturers colour code their hearing aid batteries for easy identification.
All these hearing aid batteries use the Zinc Air chemistry. This system uses oxygen from the atmosphere as an active ingredient which allows the battery to pack in an enormous amount of energy for their size and weight..
These hearing aid batteries all have a small hole in the case that allows air into the battery, which is used as part of the chemical reaction. The battery is not activated until the plastic seal is removed.
Vehicle Batteries
