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Why Battery Voltage Varies Between Different Testers?
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Boris_yo:
Hi. Tested new alkaline battery 1.5v and here are the readings I got:

1. Chinese battery tester: 1.27v
2. Aneng brand Chinese battery tester: 1.50v
3. Chinese multimeter: 1.53v

Used lithium AA single-use battery:

1. Chinese battery tester: 1.23v
2. Aneng brand Chinese battery tester: 1.48v

Tested Sanyo 2500mAh barely charged AA battery:

1. Chinese battery tester: 1.03v
2. Aneng brand Chinese battery tester: 1.11v

Tested 9v alkaline rectangular battery:

1. Chinese battery tester: 8.85v
2. Aneng brand Chinese battery tester: 9.12v

It seems that while multimeter puts on zero load, the battery testers put a tad bit. Though why readings between both battery testers vary?
Ed.Kloonk:
Are these 'testers' analog meter variety? The cheaper the meter component the more inaccurate they are.

A analog meter is supposed to considered *most accurate at FSD (full scale deflection). Connect them to a good variable power supply and set the output to what the maximum range the meter should read. If that is anywhere near accurate, then check the meter at 1/4, 1/2, 3/4 range to see how good it is.


edit: most
WattsThat:
Yes, battery testers load the battery, a multimeter/DMM does not.
Ed.Kloonk:

--- Quote from: WattsThat on September 18, 2022, 04:32:22 am ---Yes, battery testers load the battery, a multimeter/DMM does not.

--- End quote ---

I see now the question asked. Disregard my answer. Sorry.
tooki:

--- Quote from: Boris_yo on September 18, 2022, 04:12:06 am ---Hi. Tested new alkaline battery 1.5v and here are the readings I got:

::snip::

It seems that while multimeter puts on zero load, the battery testers put a tad bit. Though why readings between both battery testers vary?

--- End quote ---
Yes, a multimeter places essentially no load, while a tester places a load. As for the differences — well, think about it for a moment: what would cause a difference in measured voltage? Give us your hypothesis and we’ll let you know if it’s right.
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