![]() ![]() The same snap style connector is used on other battery types in the Power Pack (PP) series. The connectors on the battery are the same as on the connector itself the smaller one connects to the larger one and vice versa. The smaller circular (male) terminal is positive, and the larger hexagonal or octagonal (female) terminal is the negative contact. The battery has both terminals in a snap connector on one end. Other nine-volt batteries of different sizes exist, such as the British "Ever Ready" PP series and certain lantern batteries. In Switzerland in 2008, 9-volt batteries totalled 2% of primary battery sales and 2% of secondary battery sales. ![]() In 2007, 9-volt batteries accounted for 4% of alkaline primary battery sales in the US. Carbon-zinc types are made with six flat cells in a stack, enclosed in a moisture-resistant wrapper to prevent drying. These cells are slightly smaller than LR8D425 AAAA cells and can be used in their place for some devices, even though they are 3.5 mm shorter. Most nine-volt alkaline batteries are constructed of six individual 1.5V LR61 cells enclosed in a wrapper. The size, regardless of technology, is commonly designated PP3 (originally a Zn-C type). This type is designated NEDA 1604 and IEC 6F22 (zinc-carbon) or MN1604 6LR61 (alkaline). Mercury oxide batteries in this form have not been manufactured in many years due to their mercury content. This format is commonly available in primary carbon-zinc and alkaline chemistry, in primary lithium iron disulfide, and in rechargeable form in nickel-cadmium, nickel-metal hydride and lithium-ion. They are also used as backup power to keep the time in certain electronic clocks. This type is commonly used in walkie talkies, clocks and smoke detectors. It has a rectangular prism shape with rounded edges and a polarized snap connector at the top. The nine-volt battery, or 9-volt battery, in its most common form was introduced for the early transistor radios. ![]() Rechargeable (NiMH) 9-volt battery internals. ![]()
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