Discover the Power of Multimeter Battery Testing with DT-182

AI Thread Summary
The DT-182 multimeter features a setting for testing 1.5V batteries, indicating a load current of 40mA. When testing, a fairly full battery typically shows a reading around 35, which reflects its ability to supply current. The test operates by applying a load to the battery, as voltage can drop with current draw and age. A battery that is partially exhausted will fail to deliver the rated current, resulting in a lower reading on the multimeter. This method effectively assesses the battery's performance under realistic conditions.
martix
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So I have this small multimeter - DT-182.

There are some settings for checking batteries. On the 1.5V battery setting in little parentheses below there is written 40mA.
So a fairly full battery displays around 35 something on the screen.

What is this "something" and how exactly does this test work?
 
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The purpose of a battery is to supply electric current at the rated voltage. Batteries should always be tested 'on load' because the voltage falls with current draw and age.
A (partly) exhausted battery will not be able to supply the rated current at the rated voltage. This is what your meter is testing.

The multimeter connects a resistor designed to draw a suitable load current from the battery. If the battery is (partly) exhausted the meter will display this reduced output.
 

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