11.5 The Unpopulated 2-Pin Header (P6)
Usually you don’t need to worry about the CR2032 battery because it can last for years. However, if
you want to use a different 3V power source, you can make use of this header. The two pins of this
header directly connect to the two poles of CR2032 battery. If you are using a rechargeable CR2032
battery, you may also use this header to charge it.
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