4 AA battery pack with DC power plug

Product Name: 4 AA (Size 5) Battery Holder with DC Power Plug

Appearance and Structural Features:
Overall Structure: This is a compact black square battery holder designed specifically to accommodate four AA (Size 5) batteries. The batteries are arranged side by side, giving it an almost square shape and greatly optimizing the use of flat space.

Materials and Manufacturing:
Shell: The main body is made of black PP (polypropylene) or ABS engineering plastic, which offers good insulation and chemical resistance. The surface has a matte finish.
Contacts: Internally, there are high-elasticity nickel-plated coil springs (negative terminals) and metal tabs (positive terminals) to ensure stable battery contact and excellent conductivity.
Fixings: Golden plum blossom-shaped rivets can be seen on the sides, used to secure the internal conductive plates. The craftsmanship is solid.

Functional Design (Key Features):
DC Power Output: The most notable feature is a black wire with a DC male plug (usually 5.5mm x 2.1mm standard size) extending out. This design allows the battery holder to be directly plugged into devices with a DC female socket, such as routers, surveillance cameras, or LED strips, without the need for welding or adapters.
No Cover or Switch: This model features an open frame design with no protective cover or built-in switch. The batteries are installed exposed, making it suitable for use inside devices with an outer shell or for temporary power testing.
Polarity Indication: Each battery slot is clearly marked with "1.5V", "4AA", and positive/negative polarity symbols to prevent incorrect battery installation.

Dimension Specifications (Based on Image Labels):
Length: 61.55mm
Width: 57.2mm
Height: 15.5mm
This is a very compact square footprint, perfect for flat devices with strict length-to-width ratio requirements.

Electrical Characteristics: Internally, it's a series circuit design, and four AA batteries can provide a DC output voltage of 6V.