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Using a Multimeter to Measure Battery Capacity and Check Diodes: A How-To Guide

kieraso341 32460 10
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  • #1 16343329
    kieraso341
    Level 5  
    Posts: 145
    Rate: 24
    Hello, is it going to measure the battery capacity with a multimeter? How to do it? Does it go to check the diode with a multimeter?
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  • #2 16343345
    rafbid
    Level 33  
    Posts: 2450
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    And what is the battery?
  • #3 16343388
    kieraso341
    Level 5  
    Posts: 145
    Rate: 24
    I mean standard AA batteries or batteries from the phone.
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  • #4 16343399
    kkknc
    Level 43  
    Posts: 23446
    Help: 1901
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    Using mA, we expect the rest of Ochma's law.

    Moderated By dondu:

    Skipping the typo in which Ohm in the grave falls over, the friend wants to damage the multimeter asking or at least a fuse!

    Warning for repentance, in particular advising in the beginners department.

  • #5 16343402
    kieraso341
    Level 5  
    Posts: 145
    Rate: 24
    Because I just turned on the mA mode and nothing shows.
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  • #6 16343414
    kkknc
    Level 43  
    Posts: 23446
    Help: 1901
    Rate: 6611
    Turn on a series with a resistor or a light bulb. And count to the final voltage. Of course, you will unload the battery.
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  • #7 16343417
    rafbid
    Level 33  
    Posts: 2450
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    You need a receiver with a known power consumption and you need to measure the time until the voltage on the battery drops to the voltage at which the batteries are considered discharged.
    kieraso341 wrote:
    Because I just turned on the mA mode and nothing shows.
    Check the fuse in the meter.
  • #8 16343484
    kieraso341
    Level 5  
    Posts: 145
    Rate: 24
    OK I understand. I have one more question, whether to measure the battery charging current in the car with an automatic meter, simply connect the black lead to com red to vmA and set the range on the voltage constantly? Does the red wire need to be connected to the 10A socket?
  • #9 16343495
    vodiczka
    Level 43  
    Posts: 30170
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    kieraso341 wrote:
    Because I just turned on the mA mode and nothing shows.
    Did you short the battery with the meter in the "mA" range? The fuse was dropped as it suggests rafbid or the meter because even a fully discharged battery will show 50-200mA.
    You can shorten the normal AA battery temporarily (1-2 seconds) with a meter set to the 10 (or 20) A range.
    If the short-circuit current is above 3A, the battery is in good condition.
    Do not test the battery from the phone because you will destroy it.
  • #10 16343503
    rafbid
    Level 33  
    Posts: 2450
    Help: 153
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    kieraso341 wrote:
    whether to measure the charging current of the battery in the car with an automatic meter, simply connect the black lead to com red to vmA and set the range on the voltage constantly?
    So you will measure the charging voltage.
  • #11 16343506
    vodiczka
    Level 43  
    Posts: 30170
    Help: 1183
    Rate: 4288
    kieraso341 wrote:
    Does the red wire need to be connected to the 10A socket?
    Mandatory 10A otherwise recommend a fuse or meter :(
    You set the 10A DC current range and not the voltage range.
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Topic summary

✨ The discussion focuses on using a multimeter to measure battery capacity and check diodes. Users inquire about measuring standard AA batteries and phone batteries, with suggestions to use a resistor or light bulb in series to unload the battery for accurate voltage readings. It is emphasized that measuring the charging current in a car requires connecting the multimeter correctly, with the black lead to COM and the red lead to the mA or 10A socket, depending on the measurement type. Caution is advised against shorting phone batteries, as this can damage them. The importance of checking the meter's fuse is also highlighted.
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