Battery voltage increases when voltmeter connected

AI Thread Summary
When a voltmeter is connected to a AA rechargeable battery, users have observed a slow increase in voltage readings. This phenomenon may occur due to a weak battery in the voltmeter itself, which can affect the accuracy of the measurement. Additionally, external factors like heat from the user's hand can enhance the chemical reactions within the battery, temporarily boosting voltage. Clarification on the exact voltage range and connection methods used is often sought, as there are limited ways to connect a digital voltmeter (DVM) to a battery. Overall, ensuring the voltmeter is functioning properly is crucial for accurate voltage readings.
damosuz
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When I connect a AA rechargeable battery directly to a voltmeter, voltage increases slowly, regardless of the way I connect it. I can't figure out why.
 
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damosuz said:
When I connect a AA rechargeable battery directly to a voltmeter, voltage increases slowly, regardless of the way I connect it. I can't figure out why.
Increases from what to what? And what do you mean by "regardless of the way I connect it"? There aren't that many ways to connect a DVM to a battery... :smile:
 
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damosuz said:
When I connect a AA rechargeable battery directly to a voltmeter, voltage increases slowly, regardless of the way I connect it. I can't figure out why.
This happened to me last year when I was measuring the voltage on a car battery.
It turned out the battery in my voltmeter was going dead.
Replacing the battery in the voltmeter made the problem go away.
 
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Sometimes the heat from your hand is enough to boost the chemical reaction in the battery increasing the voltage.
 
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berkeman said:
Increases from what to what? And what do you mean by "regardless of the way I connect it"? There aren't that many ways to connect a DVM to a battery... :smile:
Correctly anyway. I wondered the same thing.
 

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