MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Batteries. An assortment of different types, sizes and brands of battery. Batteries are devices for converting chemical energy into electrical energy. They are commonly used for powering electrical equipment such as watches, cars and torches. The output and effective life of a battery depends on which chemicals it uses to produce the electric current.
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