Also known as 6LR61 or MN1604, 9V batteries are most often used in electrical devices such as walkie-talkies, clocks, and smoke detectors to name a few. These batteries are not as popular as AAA or AA type cells, but certainly essential for the right appliances. We offer one of the widest selections of 9V batteries online in the market from leading brands that you know and trust, including Energizer, Duracell, everActive, Sony, GP, and Varta. A 9-volt battery is shaped as a rectangular typically 48.5mm (1.91in) high. If you’re looking for quality products at great prices, you’re in the right place.