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Test Batteries With a Multitester

Not sure about your smoke alarm battery? Wondering about the mystery batteries in your kitchen drawer? Check them with a multitester to find out instantly if they still have juice.

By the DIY experts of The Family Handyman Magazine

Testing procedure

Multitesters have many uses, and one of the handiest is testing common household batteries. A weak or dead smoke alarm battery in a fire, or a dim flashlight bulb during a blackout, can be downright dangerous. Pull out that multitester and check those vital batteries so they're ready when you need them.

Insert the black probe into the (-) terminal, and the red probe into the (+) terminal. Rotate the voltage selector switch until it points to the voltage you're testing, and then test batteries as shown in Photos 1 and 2.

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