Features: DIY 18650 battery holder box, can be connected in series or parallel. SMD gold-plated 18650 battery box, 3-slot/4-slot 18650 battery holder available. Quality materials, flame retardant and high-temperature resistant, safe to use. Small size, easy to carry, and convenient to use. The product can only be used under a temperature of 235℃. (If the temperature is above 235℃, it will bubble and cannot be reflow soldered). Specifications: Material: Plastic+Metal Type: 3-section, 4-section(optional) 3-Section: Approx. 78x61mm/3.07x2.4inch 4-Section: Approx. 78.5x81mm/3.09x3.18inch Package Includes: 1x 18650 Battery Holder note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.