page_title: AAAA battery
section_title: Uses
hierarchical_section_title: AAAA battery / Uses
caption_attribution_description: English: Collage of images showing the dissection of a 9V (PP3) battery to reveal the 6 AAAA-like cells inside. AAAA batteries are sometimes used in small devices like laser pointers and some remote controls. They are quite expensive and it is often cheaper to buy a well known 9V brand and take it apart to get to the cells inside. These cells are in fact LR61 which are about 3 mm shorter than AAAA (LR8D425) cells. However they are the same voltage and can be used in place of proper AAAAs and should function just as well. Although care should be taken with the difference in length and the lack of polarity markings on the cells themselves. The red battery shown in the final image is a AAAA size, to show the minute difference in sizes.
context_page_description: The AAAA battery is 42.5 mm long and 8.3 mm in diameter. The alkaline cell weighs around 6.5 g and produces 1.5 V. This size battery is also classified as R8D425 and 25. The alkaline battery in this size is also known by Duracell type number MN2500 or MX2500 and Energizer type number E96.
  Historically its consumer electronics use was very limited, and only since the 2010s has it made its appearance in the stores where one would buy its more common AAA relative.
context_section_description: This battery size is most often used in small devices such as laser pointers, LED penlights, powered computer styluses, glucose meters, and small headphone amplifiers. These batteries are not as popular as AAA or AA type batteries, and consequently are not as commonly available.
  Some models of alkaline nine-volt battery contain six LR61 cells connected by welded tabs. These cells are similar to AAAA cells and can be used in their place in some devices, even though they are 3.5 millimetres (0.14 in) shorter.
caption: The opening of a 9-volt battery to reveal six LR61 cells, which are similar to AAAA cells.
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