Reed/PIR sensors and battery voltages

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sp acbell

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Oct 1, 2016, 12:04:43 PM10/1/16
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I have several reed sensors and a PIR sensor, and I noticed that the battery values are completely wrong.  They remain flat around 3 V, sometimes even rising, and then they go out of range, ie. their battery dies.

Is this how it's supposed to work?  The other sensors I have will show more accurate/believable voltage measurements and will signal as they get close to failing, but I can't do that with all of my reed sensors.
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