Product Name: CR2450 Button Battery Holder (Through-hole/with Alignment Post)

Appearance and Structural Features:
Overall Structure: This is a black, round battery holder designed specifically for CR2450 lithium-manganese button batteries. It features a split design (consisting of a base and a top cover) or an open snap-fit structure that allows the battery to be directly inserted.

Materials and Manufacturing Process: The main body is made of black, high-temperature resistant engineering plastic (usually nylon PA66 or PBT), which offers excellent insulation and flame retardancy.

Contact System (Key Features):
Positive Contact: There is a wide metal spring tab in the center of the bottom for making contact with the front side (positive terminal) of the battery.
Negative Contact: A metal spring tab is located on the side for making contact with the edge (negative terminal) of the battery.
Pin Design: The diagram clearly shows its unique pin layout. In addition to the soldered pins for the positive and negative terminals, there is also a protruding plastic alignment post in the middle. This design is very clever as it prevents the battery holder from shifting during wave soldering or reflow soldering, and it also facilitates pre-fixing on the PCB board.

Dimension Specifications (Based on Drawings):
Outer Diameter: $ phi$26.50mm
Inner Diameter (Battery Compartment): $ phi$24.70mm
Height: Approximately 9.20mm (including pins)
PCB Layout Hole Spacing: The center-to-center distance between the two mounting/soldering holes is 15.10mm + 5.20mm = 20.30mm (horizontal span).
Hole Diameter: 2 - $ phi$1.30mm.
Environmental Certification: The "RoHS" mark is indicated in the upper left corner of the drawing, indicating that this product complies with EU directives restricting the use of certain hazardous substances in electronic and electrical equipment. It is a lead-free, environmentally friendly product.

Yueqing Feiben Electronic Switch Factory specializes in manufacturing a series of products including AA,AAA,D,C,N,18650,21700. These products are suitable for low-voltage electrical appliances, household appliances, instruments, meters, electronic toys, and other applications operating at alternating current (AC) 50Hz with voltage below 250V and direct current (DC) voltage below 220V.
Feiben Electronic not only sells well across the country but also has achieved sales overseas. Adhering to the philosophy of 'Surviving through quality and reducing costs through management,' Feibun aims to better serve society. Feibun Electronic is committed to creating brilliance together with you in the new century.