Never carry spare batteries in your trouser pocket or handbag- they could come into contact with loose change, keys or other metallic objects. If this happens, they can easily short- circuit, causing them to become very hot and in extreme cases, explode. Store and transport your 18650 batteries safely and conveniently with this clear plastic battery case. The small, convenient clear case holds 2 18650 batteries and has a snap shut closure so that you never lose the lid. This Dual 18650 Battery Case is an inexpensive but essential piece of kit, particularly if you are planning to travel and want to take some spare batteries along.