3 AA battery pack with a knife switch and wires

Product Name: 3 AA (Size 5) Battery Holder with Knife Switch and Wires

Appearance and Structural Features:
Overall Structure: This is a black rectangular open-type battery holder designed specifically to accommodate three AA (Size 5) batteries. It features a single-row vertical layout, making it compact in size.

Materials and Manufacturing:
Shell: The main body is made of black PP (polypropylene) resin, which offers good insulation and chemical resistance. The surface has a matte finish.
Contacts: Internally, there are high-elasticity nickel-plated spiral springs (negative terminal) and metal tabs (positive terminal) to ensure secure battery contact. The rivets are made of nickel-plated brass, providing excellent electrical conductivity.

Functional Design (Key Features):
Integrated Knife Switch: A metal toggle knife switch is built into the side of the battery holder. This is a classic mechanical switch design that uses a metal lever to connect or disconnect the circuit. It offers a clear operating feel, has a vintage industrial style, and is also very durable.
Wired Output: Red and black wires are led out from the side (red wire for positive, black wire for negative). According to the drawing specifications, the wire is UL1007 26# AWG, approximately 150mm (15cm) long, with stripped and tinned ends for easy direct soldering or terminal connection.
Mounting Holes: Circular screw mounting holes are provided in the middle partition and edges of the battery holder (drawing specifies hole diameters of Φ4mm and Φ5mm) to securely fix the holder to the device's bottom plate.
Polarity Indication: Each battery slot is clearly marked with "1.5V", "AA", and positive/negative polarity symbols to prevent incorrect battery installation.

Dimension Specifications (Based on Drawing):
Total Length: Approximately 57.8mm
Width: Approximately 46.5mm
Height: Approximately 15mm

This is a very compact design, ideal for small devices with limited space.

Electrical Characteristics: The internal circuit is designed as a series connection, and three AA batteries can provide a DC output voltage of 4.5V.