These breakout board has a CR1220 coin cell battery holder soldered on and comes with an on/off switch and 0.1" pitch breakout pins for easy mounting onto breadboards or to connect with jumpers. Great for powering up very low power projects, or adding a battery backup circuit to a real time clock. There's two ground pins, one 'switched' power pin, and one pin that is always on. The pack comes with one fully assembled and tested breakout plus a small stick of 0.1" header so you can solder it on and plug into a breadboard.
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