* Look for the markings on the battery. Most batteries have the positive terminal marked with a "+" symbol and the negative terminal marked with a "-" symbol.
* Use a voltmeter. A voltmeter can be used to measure the voltage between the two terminals of a battery. The positive terminal will be the one with a higher voltage.
* Touch the terminals with your tongue. This is not the safest method, but it can be used to quickly determine which terminal is positive and which is negative. The positive terminal will taste sour, while the negative terminal will taste bitter.
It is important to be able to identify the positive and negative terminals of a battery, as connecting them incorrectly can damage the battery or the device that it is powering.
