How to check alkaline battery good?

Question

How to check alkaline battery good?

Answer 1

If you are talking about Edison batteries then:

This rechargeable battery was introduced in 1900 by Thomas Edison. It is a very robust battery which is tolerant of abuse and can have very long life even if so treated. It is often used in backup situations where it can be continuously charged and can last for 20 years. Also called Nickel Alkaline of NiFe batteries.

The open circuit voltage of these cells is 1.4 V, and the discharge voltage is about 1.2 V.

Answer 2

Measure the voltage under medium load.  The voltage should be > 1.4 volts across a resistance of 10 to 50 Ohms.

The open circuit voltage may indeed be greater than 1.4 or 1.5 volts, but if you apply a load, the voltage will drop on if the battery is weak or dead.

Anything less than about 1.2 volts and the battery is gone.

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