The nine-volt battery, or 9-volt battery, is a common size of battery that was introduced for the early transistor radios. It has a rectangular prism shape with rounded edges and a polarized snap connector at the top. This type is commonly used in walkie-talkies, clocks and smoke detectors.

Alternatively referred to as a button cell or watch battery, a coin cell battery is a battery for retaining important system settings while a device is off. For instance, it provides power to the system clock so that the computer can remember what time it is after being powered off.

Lithium-ion batteries are used for powering many different items from small earbuds and earphones through to mobile phones, tablets, laptops and a host of other electronic gadgets and items. Cordless power tools make widespread use of li-ion batteries as do other electrical items.

A terminal or a connecting wire that can be quickly snapped on a terminal of a battery, to which a temporary wire connection is desired.