Simple but effective - this breakout board has a CR1220 coin cell battery holder soldered on, an on/off switch and 0.1" pitch breakout pins for easy connecting. Great for powering very low-current projects, or adding a battery backup circuit to a real-time-clock or similar. There's two ground pins, one 'switched' power pin, and one pin that is always on. https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-04-06 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-05-14 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-05-17 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-05-24 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-06-22 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-08-13 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-08-19 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-09-30 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-10-29 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-11-06 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2021-11-11 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-03-22 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-05-18 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-09-01 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-10-03 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-10-13 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-10-14 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-10-21 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-11-20 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2022-12-01 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-02-14 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-02-28 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-03-07 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-03-13 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-03-14 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-03-15 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-03-16 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-03-17 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-06-20 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-06-21 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-06-23 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-06-26 https://elecena.pl/product/17500036/12mm-coin-cell-breakout-w-on-off-switch 2023-06-27