https://devzone.nordicsemi.com/f/nordic-q-a/20866/does-nfc-content-on-nrf52832-remain-readable-when-not-poweredHi all, We are currently developing a BLE enabled sensor device. We want to use the NFC component to identify the sensor by writing a device ID to the tag. Question: Will the NFC component retain it&#39;s contents when the battery is removed/goes flaten-USTelligent Community 13Wed, 29 Mar 2017 09:21:39 GMThttps://devzone.nordicsemi.com/thread/81484?ContentTypeID=1Wed, 29 Mar 2017 09:21:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:808ecd14-c36e-4c0a-b18b-def5fd76e8c8FormerMember<p>The NFC data is stored in RAM. So if the chip is power cycled (f.ex flat battery), the content will be lost. If you want to make sure NFC data is not lost upon a power cycle, the data should be stored in flash. To do so, you can use the <a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v13.0.0%2Flib_fds.html&amp;cp=4_0_0_3_43">Flash Data Storage module</a> (FDS).</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/81483?ContentTypeID=1Tue, 28 Mar 2017 09:00:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a4aa34c9-f63a-4050-8e1f-9dcff72375c4endnode<p>Well this depends on how you implement the app data management on top of NFC communication protocols (I believe this applies even if you use LIBs provided by Nordic). However nRF52 chips cannot work in &quot;battery off&quot; mode, the chip must be always powered to operate, there is no inducting power transfer of nRF52 over antenna from 13MHz field so if you want to support such use case (e.g. when battery is not removable in your device) then you must populate another chip to your board.</p><div style="clear:both;"></div>