Many of the batteries that are commonly used in toys and electronic devices are 1.5 volt alkaline batteries. These batteries–which are commonly known as A, AA, AAA, C, and D–are different in size but all carry the same voltage. If your household is like many others, there are a number of these batteries lying around and you may have lost track of which ones are good and which ones no longer carry a charge. You can use a voltmeter to quickly test them. Writer Bio
