A battery holder is one or more compartments or chambers for holding a battery. For dry cells, the holder must also make electrical contact with the battery terminals. This product is a high-quality plastic holder, small in size, and easy to carry. It is a 1pcs 18650 Battery Holder Case Leads 3.7V Clip Type for Soldering/Connecting. The holder takes 1 standard size 18650 battery to form a compact battery of 3.7V using alkaline batteries. Batteries are not included. The specifications include color: black, battery type: 18650, and dimensions: approximately 7.6cmx2cm/3.0" x 0.8" for a single battery holder.