There can be several reasons why the appliance doesn't work. The battery can be wrongly inserted in the battery compartment, there can be a bad connection between the battery and the compartment connection terminal or it is possible the appliance does not work properly.

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A battery is a chemical product which produces electricity by chemical reactions at its inside. These reactions and its inside materials do deteriorate over time.

You can, but they’ll perform best in medium- to high-drain devices.

Use batteries for their right purpose: insert them correctly, replace them when empty and store them high and dry.

Batteries are best stored at room temperature. Extreme heat or cold can significantly reduce battery life.

There are different types of Panasonic alkaline batteries, each with their own specialty.

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The revised RoHS (Reduction of Hazardous Substances) Directive 2011/65/EU...

Yes, the batteries' weight does change during usage.