https://devzone.nordicsemi.com/f/nordic-q-a/110182/nrf-adc-voltage-measurement-rangHi, We&#39;re using nRF9160 ADC to measure the battery voltage. The battery voltage is divided down with a resistor divider as seems to be the case in many other designs and examples too. Now, our battery will consist of two serial Lithium Ion cells resultingen-USTelligent Community 13Mon, 15 Apr 2024 09:29:55 GMThttps://devzone.nordicsemi.com/thread/478695?ContentTypeID=1Mon, 15 Apr 2024 09:29:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e7f78021-ce11-4c2c-bf1e-76411c88177dmathiaso<p>Hi, Jyrki.</p> <p>As you can see in the <a href="https://infocenter.nordicsemi.com/topic/ps_nrf9160/gpio.html?cp=2_1_0_5_3_4#unique_1131180181">nRF9160 Product Specification</a>, the maximum input high voltage is VDD. Thus, this should be followed.</p> <p>I recommend that you have a look at <a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/measuring-lithium-battery-voltage-with-nrf52">this blog post</a> explaining how to perform voltage measurements with minimum leakage current.</p> <p>Best regards,<br />Mathias</p><div style="clear:both;"></div>