https://devzone.nordicsemi.com/f/nordic-q-a/51945/how-to-enable-coin-cellHi, I would like to power my development board from the provided coin cell. I removed the plastic between battery and negative contact point. I put VDD position on power source switch but nothing happened. Is it because I have to solder SB35 to be ableen-USTelligent Community 13Tue, 10 Sep 2019 11:12:57 GMThttps://devzone.nordicsemi.com/thread/208882?ContentTypeID=1Tue, 10 Sep 2019 11:12:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8f966449-d5cc-4431-ac31-f336dcc8baceAmanda Hsieh<p>Hi,&nbsp;</p> <p></p> <p>Please try this setting:</p> <ul> <li>nRF power source switch (SW9):&nbsp;VDD (default)</li> <li>According to&nbsp;<a title="Solder bridge configuration" href="https://infocenter.nordicsemi.com/topic/ug_nrf52840_dk/UG/nrf52840_DK/solder_bridge.html?cp=3_0_4_7_12">Solder bridge configuration</a>: <ul> <li>SB35&nbsp;Short to bypass the power switch on the coin cell battery power</li> <li>SB39&nbsp;Short to bypass the power switch for regulator, coin cell, or external supply</li> </ul> </li> </ul> <p><span>Make sure that you only connect the external supply and no other power source.&nbsp;</span></p> <p><span></span></p> <p><span>-Amanda H.</span></p><div style="clear:both;"></div>