This is a 4-slot 18650 battery holder case featuring integrated wire leads for easy connection. Designed to hold four rechargeable 18650 lithium-ion cells in series, it provides a stable 14.8V output configuration for DIY electronics, robotics projects, and custom power bank creation. The compact, lightweight plastic enclosure includes robust metal spring clips to ensure secure contact and holds its shape with dimensions of roughly 80.9mm by 76.15mm.