Features: This D size battery placeholder provides a safe, dummy setups with jst connectors, enabling seamlessly integration with your devices without actual battery power. Crafted from quality steel, each dummy shell features 23cm input wire (red and black) for precise polarity alignment and secure DIY power adapter connection. Ideal for electronics enthusiasts, appliance repair technicians, and diyers requiring stable power solution for gadgets like LED lights or sensors base equipment. Perfect for converting battery operated appliances (heaters, gas stove, toy) to adapter powered systems while maintaining original battery compartment integrity. The nonconductive terminals prevent accidental short circuiting, ensuring safe operation when pair with compatible d size adapters in emergency lighting or portable devices. Specifications: Component: Steel Color:Blue Height:Approx.58mm/2.28inch Diameter:Approx.32mm/1.26inch Note:No.d Dummy Cell,No Internal Conductions,No Charge; Package Includes: 1pc Battery Placeholder note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.