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Photograph of a CR2032 coin cell battery on yellow background

Battery Overview#

A battery is a power source for electronic circuits that converts chemical energy to electrical energy. When the battery's positive and negative terminals are connected in a closed circuit, a chemical reaction occurs and electricity flows from the negative terminal to the positive terminal.

Battery Types#

Batteries are made in all different shapes and sizes, but for small electronics projects you'll mostly work with the following types.

  • Coin Cell
  • 9 volt
  • AA
  • AAA

Patchr Symbol#


Schematic Symbol#