Here's How To Test A CR2032 Battery To See If It's Good

You won't need expensive equipment or invest much time.

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Your car key fob suddenly needs several presses to unlock the door. Your AirTag stops responding when you try to locate it. Before blaming either gadget, it's worth checking the battery inside. One common type is the CR2032, a 3V lithium coin cell also used in Samsung's SmartTag2 and some smart home sensors. Depending on the device and how often it's used, one can last way over a year.

A multimeter can help you check the battery's voltage, and it's a good addition to your toolbox if you don't already own one. There are cheaper ways to check, too, but don't mistake a voltage reading for a complete picture of battery health.

How to test a CR2032 battery with a multimeter

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Begin by checking the battery itself. If you spot crusty residue, rust-colored patches, swelling or leakage,...

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