user77264: I would like to power my arduino nano with a 9V battery, but I would also like to measure the voltage of the battery to know its charge level.
Can I use the MAX471 Voltage Current Sensor module by connecting the VIN pin to my battery and VOUT to my arduino ?

user-1: If you want measuring a "battery level" in mAh for example, you must measure Voltage AND Current, so INA219 is a better deal (it is a I2C control).

77264: <p>I would like to power my arduino nano with a 9V battery, but I would also like to measure the voltage of the battery to know its charge level.<br />
Can I use the <a href="https://aliexpress.com/item/32672702701.html?src=google&amp;albch=shopping&amp;acnt=248-630-5778&amp;isdl=y&amp;slnk=&amp;plac=&amp;mtctp=&amp;albbt=Google_7_shopping&amp;aff_platform=google&amp;aff_short_key=UneMJZVf&amp;&amp;albagn=888888&amp;isSmbAutoCall=false&amp;needSmbHouyi=false&amp;albcp=10191220517&amp;albag=107473525088&amp;trgt=743612850874&amp;crea=fr32672702701&amp;netw=u&amp;device=c&amp;albpg=743612850874&amp;albpd=fr32672702701&amp;gclid=Cj0KCQjw2NyFBhDoARIsAMtHtZ60kZjqZf6Pn0b21O_8pnOQl4r2uiEo-iRub2k4lLdjbPr-t_sww7MaAvAQEALw_wcB&amp;gclsrc=aw.ds" rel="nofollow noreferrer">MAX471 Voltage Current Sensor</a> module by connecting the VIN pin to my battery and VOUT to my arduino ?</p>
 -1: <p>If you want measuring a &quot;battery level&quot; in mAh for example, you must measure Voltage AND Current, so INA219 is a better deal (it is a I2C control).</p>
