The Efest H2 dual-slot Battery Case is the safest and most convenient way to store your batteries. Small in size and sturdy in construction, the Efest H2 case can store up to two 18650 batteries and up to four 18350 batteries. No need to worry about your batteries shifting or falling out, the H2 case snaps tightly and secures your batteries when they're not in use. The transparent case allows you to see your batteries without having to open the case.