A quickly decreasing voltage indicates that the battery or batteries will have to be replaced soon. The idea behind the circuit described here is to load a single battery, a set of batteries connected in series, a rechargeable battery, or even a small button cell with a reasonably constant current and use a separate multimeter or voltmeter module (M1) to check the voltage. Naturally, tests of this sort do not provide especially reliable or accurate results. If you press this strip over the battery between the positive and negative terminals, a fully charged battery will cause a more intense change in color than a partially discharged battery. Some manufacturers include an even simpler tester with a set of batteries, consisting of a strip of plastic with a layer of some sort of electrically conductive material that changes color when a current grows through it. Many commercial battery testers consist of nothing more than a resistor, a simple little meter and a push-button.
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