DescriptionA 1S 21700 lithium battery box is a protective enclosure or holder designed to safely house a single 21700 lithium-ion battery cell (1S = 1 cell in series). These boxes are commonly used in DIY electronics, vaping devices, flashlights, and custom battery packs.Specification:1. Mechanical SpecificationsCell Compatibility:Fits 21700 Li-ion cells (21mm diameter × 70mm length).Material:Plastic Dimensions:Internal: ~21.5–22mm (diameter) × ~70–72mm (length).External: Varies (~25–30mm wide × 75–80mm long).Mounting: snap-fit design.2. Electrical SpecificationsTerminal Type:Spring-loaded contacts (for secure connection).Contact Material:Nickel-plated steel, brass, or copper (low resistance).Max Current Rating: 5A–10A3. Safety & Protection FeaturesInsulation: Prevents short circuits.Vent holes: Allows gas escape in case of overheating.Locking mechanism: Secures the battery in place.Common Uses:Custom battery packs (e.g., for flashlights, drones, or portable devices).Vape mods & DIY power banks.Replacement battery holders for electronics.Robotics & hobby projects.