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CR-P2: BR-P2 223A CR17-33 5024LC: CR-P2: 5024LC [139] 1,500: 6: Double cylinder. Keyed. Both on one end. Terminal diameter: 8.7 mm Terminal center spacing: 16.8 mm. H: 36 mm L: 35 mm W: 19.5 mm Shaped so that it can be inserted into a battery compartment only one way. Typical mass: 37 g. They contain two 3 V cells exchangeable with CR123 cells ...
A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board. The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15.
It is poor engineering to specify a CR instead of an R simply on the theory of enforcing good workmanship. CR is for critical features whose performance truly requires near-perfect geometry. Like most such characteristics, its presence increases the price of the part, because it raises the costs of manufacturing and quality assurance. CRES
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Button, coin, or watch cells. A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically 5 to 25 mm (0.197 to 0.984 in) in diameter and 1 to 6 mm (0.039 to 0.236 in) high – resembling a button.
Typical O-ring and application. An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, forming a seal at the interface.