3 AAA battery holders ，with wires, open type

Product Name: 3 AAA (7) Battery Holder (with Wires, Open Type)

Appearance and Structural Features:
Overall Structure: This is a compact black rectangular battery holder designed specifically for holding three AAA (7) batteries. It features a single-row vertical layout, making it small and lightweight.

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, which has excellent electrical conductivity and rust resistance.

Functional Design (Key Features):
Wired Output: Red and black wires are directly led out from the back (red wire for positive, black wire for negative). According to the drawing specifications, the wire is UL1007 26# AWG, approximately 150mm long, with stripped and tinned ends for easy direct soldering or terminal connection.
Open Design: This model features an open frame design without a protective cover. This design is typically used when it needs to be embedded inside a device's casing, where the casing provides protection and battery retention.
Mounting Holes: The middle partition and edges of the battery holder have round screw mounting holes (drawing specifies hole diameters of Φ2.5mm and Φ5mm) for securely fixing the holder to the device's bottom plate.
Polarity Indication: Each battery slot is clearly marked with "1.5V", "AAA", and positive/negative polarity symbols to prevent incorrect battery installation.

Dimension Specifications (Based on Drawing):
Total Length: Approximately 50.87mm
Width: Approximately 35.68mm
Height: Approximately 11.8mm

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

Electrical Characteristics: Internally, it's a series circuit design, and three AA batteries can provide a DC output voltage of 4.5V.