https://devzone.nordicsemi.com/f/nordic-q-a/80169/npm1100-maximum-battery-capacity-500mahHi there, In the video that was just posted about the nPM1100 EK it is stated (at 1:18) that the battery charger of the nPM1100 must be used with batteries of a size less than 500mAh: The closest I can find to this statement in the infocenter isen-USTelligent Community 13Mon, 04 Oct 2021 17:59:28 GMThttps://devzone.nordicsemi.com/thread/332429?ContentTypeID=1Mon, 04 Oct 2021 17:59:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2689f83d-b072-45ce-a863-e64e91b1ed35Marjeris Romero<p>Hi Richard,</p> <p>The nPM11000 has an adjustable charge current from 20mA to 400mA. There is no maximum battery size but more a recommendation due to the charging rate and user experience. <br /><br />Usually you want to charge a battery with 1C or a bit lower, it means the charge current in mA match the capacity in mAh, and you use approx 1 hour to go from empty to full battery. Smaller batteries are commonly rated at 1C rating. You will generally find the C rate of your battery on it&#39;s label and on the battery datasheet.</p> <p>You are of course free to use the nPM1100 with as big as a battery as you want, but since the charger current is limited to 400mA, a 800mAh battery willl for instance take 2 hours to charge from 0-100%, a 1200mA battery will use approx. 3 hours, and so on...<br /><br />Best regards,</p> <p>Marjeris</p><div style="clear:both;"></div>