You know how to operate a look at multimeter battery? Very interesting. We take any battery and a multimeter measure the voltage. And unless the battery to operate a multimeter, then the instrument readings will show that the measured battery voltage increases to your eyes! 
Maybe you can even skip the tricks with this tseshkoy Vobschem in multimeter battery is 9v, so I had to buy a new one, and unlike the previous incomprehensible manufacturer, this time I decided to buy a proven brand Dyurasel. However, because the measure was nothing, I remained in the dark, how many volts primary voltage in a battery. Then, as a check up is mandatory.
Vobschem nothing special:
Duracell batteries
Voltage: 9V
Form Factor: 6LR61 or MN1604
Technology: Alkaline
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