Built with industrial springs and color coded wiring for instant polarity recognition, this battery pack box is designed to withstand daily wear while maintaining reliable electrical conductivity for 3A battery configurations. Equips a built in switch and carrying cord, allowing you to easily control power flow to battery powered devices without soldering. Designed for a four pack setup: 4 pcs of 3A Battery Pack boxes with Switching, Cord and Lid, with no soldering required. Includes a transparent lid and switch: the lid opens to access the battery holder quickly, saving time and energy during setup and maintenance. Clear and practical construction emphasizes function and compatibility: built for 3A battery configurations, with color coded wiring for easy identification and reduced wiring errors. Durable and easy to use: the combination of industrial springs, switching, and lid access provides a stable power solution for portable or project installations. Practical use scenarios: Building a portable battery power supply for field projects, such as sensors, LED lighting, or small measurement devices, where quick on/off control is beneficial. Educational electronics kits or DIY prototyping that require a ready to assemble four pack power source with simple switching and lid access. Hobby robotics or model projects needing a compact, easy to four pack battery box with switch to manage power delivery.