Another thing you can do is feel the battery to see if any particular spot is producing more heat than other areas of the battery pack. If after doing those things you feel like your battery might be bad, then you will have to tear it down enough to be able to measure the voltage of each cell group.
Touch the red probe to the battery’s positive terminal and the black probe to its negative terminal. You should have a working battery if the multimeter reading is close to the voltage written on the battery. However, if the reading is lower, it’s probably dead. For more tips, including how to test a 9-volt battery, read on!
Alternatively, use a multimeter to test your battery by turning the knob to 20 on the “DCV” or “V” side. Touch the red probe to the battery’s positive terminal and the black probe to its negative terminal. You should have a working battery if the multimeter reading is close to the voltage written on the battery.
Measure the time it takes for the battery to discharge completely. If the battery runs out of power quickly or fails to reach its rated capacity, it may need replacement. A discharge test determines the battery’s ability to sustain a steady output under load. Connect the battery to a discharge resistor and measure the voltage over time.
If you want to know how to identify and fix a broken battery, here are some general guidelines. Give the battery a visual inspection to make sure there are no burn marks or signs of leaking fluid. Use a multimeter to check the voltage of the battery to make sure it's within the expected range of the battery.
Use a multimeter or voltmeter to check your battery. Put either device on DC voltage if it's digital. Place the end of the black probe on the negative terminal and the end of the red probe on the positive terminal. Watch the readout on the multimeter. You should be looking at volts on your reader.
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