What is a Battery Tester?
A battery cell will generally carry an electric charge only for a limited amount of time, and most of the time it is difficult to tell how much of this charge remains. A useful item for determining the amount of power remaining in a battery is a battery tester, which can come in a variety of styles depending on what type of battery is being examined. Some battery testers are built right into the battery, others are built into the item that the battery is being used for, and most are portable and can be used for many varieties of batteries. Some types of battery tester are designed to test multiple batteries. The most common of these multi-battery, or universal, testers are designed to check the available charge of household batteries. These can include AA, AAA, C, D, 9-volt batteries, watch-style (lithium) batteries and more. Analog testers use a needle on their display to show the battery’s power, while digital testers use a numeric LED display. The tester usually contains slots for t
